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Published in: International Journal of Educational Technology in Higher Education 1/2021

Open Access 01-12-2021 | Research article

Towards modeling of human skilling for electrical circuitry using augmented reality applications

Authors: Ana Villanueva, Ziyi Liu, Yoshimasa Kitaguchi, Zhengzhe Zhu, Kylie Peppler, Thomas Redick, Karthik Ramani

Published in: International Journal of Educational Technology in Higher Education | Issue 1/2021

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Abstract

Augmented reality (AR) is a unique, hands-on tool to deliver information. However, its educational value has been mainly demonstrated empirically so far. In this paper, we present a modeling approach to provide users with mastery of a skill, using AR learning content to implement an educational curriculum. We illustrate the potential of this approach by applying this to an important but pervasively misunderstood area of STEM learning, electrical circuitry. Unlike previous cognitive assessment models, we break down the area into microskills—the smallest segmentation of this knowledge—and concrete learning outcomes for each. This model empowers the user to perform a variety of tasks that are conducive to the acquisition of the skill. We also provide a classification of microskills and how to design them in an AR environment. Our results demonstrated that aligning the AR technology to specific learning objectives paves the way for high quality assessment, teaching, and learning.
Extras
Additional file 1. Supplementary video explaining our paper.
Notes

Supplementary Information

The online version contains supplementary material available at https://​doi.​org/​10.​1186/​s41239-021-00268-9.

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Abbreviations
AR
Augmented reality
MS
Microskill
S
Step

Introduction

New technologies, such as augmented reality (AR), which superimposes virtual information into the physical world, provide unique hands-on capabilities to deliver educational content. In the last decade, there has been a surge of interest in acquiring knowledge through a minds-on and hands-on approach (Council, 2012; Williams et al., 2019). An AR display (e.g., a headset, a tablet or a mobile phone) provides the user with an interface to the virtual world, which enables interactions with physical objects. This virtual information is overlaid on objects and can demonstrate to users what cannot be perceived by their own senses and thus, learned (Iftene & Trandabăt, 2018) (e.g., pressure, temperature, voltage).
Great efforts have been made to develop and test empirical AR applications in education with positive results (Cai et al., 2014; Dunleavy et al., 2009; Hsiao et al., 2012; Lin et al., 2012; Rasimah et al., 2011), along with insightful design principles of AR implementation in the context of the classroom (Cuendet et al., 2013). However, we are aware of no efforts towards systematically structuring the AR learning content itself, breaking it down into bite-sized pieces, deciding what the learning content should look like, and how much of it is even necessary for the present context of a student.
As an educational tool, AR is not exempt from the design rules for multimedia learning (Mayer, 2019; Mayer & Moreno, 2003), thus it is important not to overwhelm the user with too much information, but only that which is essential and pertinent to the context. Further, for AR to be taken seriously as a learning tool, it will require design principles for creation of the learning content and for the use of the AR information being delivered with respect to students’ mastery of the content. In particular, these principles guide the understanding of how the AR medium can be leveraged for teaching and learning, by aligning the technology to learning outcomes.
This work is influenced by embodied cognition, which examines the ways in which our interactions with the physical world shape our cognitive experiences from a body-centric point of view (Wilson, 2002; Wilson & Golonka, 2013). These types of interactions, which in our case are promoted by AR technologies, can shape, clarify, and reinforce our cognitive processes in STEM areas, such as electrical circuitry (Fugate et al., 2018). In our work, in order to systematize the process of breaking down, aligning, and improving the AR content, we propose the use of Q-matrix theory, a cognitive assessment approach which evaluates the associations between questions/steps in a task and the microskills—smallest segmentation of knowledge—required to complete it (Tatsuoka, 1995, 2009). Q-matrix theory has been utilized previously for cognitive assessment in multimedia learning, but not in the context of developing AR curricula (Casalino et al., 2017; Desmarais et al., 2014; Wang & Jiang, 2018).
This paper investigates the use of Q-matrix theory as a design framework to develop an AR-based curriculum (Fig. 1). We focused on a young-adult population (18–34 years) without any prior knowledge on the subject area of electrical circuitry. The tasks chosen for the user studies involve different procedures; however, the microskills required to complete them are similar throughout the range of exercises. We will further expand on our reasoning for choosing this area in the task design section. Our contributions in this paper are as follows:
(1)
A modeling approach to systematically break down the knowledge conducive to the mastery of basic electrical circuitry using Q-matrix theory by aligning AR technology to learning outcomes.
 
(2)
Defining and selecting the microskills required to perform a variety of electrical circuitry tasks.
 
(3)
Design principles by microskill and findings of AR learning content implemented on an educational curriculum.
 

Definitions

The following definitions will be helpful to understanding recurring terminology in our educational context:
Skill. An ability which has been automated and operates largely subconsciously (Williams & Moran, 1989). It may be broken down into smaller, more manageable components or microskills.
Microskill. The specific ability, knowledge, aptitude or information required to perform a task. In cognitive assessment, the equivalent of a microskill is typically referred to as an "attribute" or piece of knowledge that a student may have acquired (Heller, 2019).
Knowledge space. The set of microskills or attributes proven to be acquired by a student upon a successful completion of a task (Köhn & Chiu, 2018; Stefanutti & Chiusole, 2017).
Task. The process or series of steps that are conducive to learning a skill, which can be decomposed into the interactions between users and equipment (Jonassen et al., 1998).
Item/step. The smallest segmentation of an action performed by a learner towards successful completion of a task (Heller et al., 2017).
Q-matrix. An assessment matrix defined by step-microskill associations required to perform a task (Cai et al., 2018). Ideally, an instructor as well as a learning sciences expert must be consulted to develop and elaborate a valuable matrix.

AR as a tool for education

AR has received much attention as a useful medium for educational content (Bower et al., 2014; Radu & Schneider, 2019; Walker et al., 2017). Much of this attention is due to the development of AR technology, which has positioned it to become widely available by deploying it on tablets and mobile phones (Sungkur et al., 2016). In terms of education settings, studies have shown that AR improves students’ learning achievement, learning motivation, and attitudes towards the materials (Akçayır & Akçayır, 2017; Chiang et al., 2014; Lu & Liu, 2015).
Additionally, AR can help students understand new material through multi-sensory learning, which can often facilitate a positive and playful attitude as students learn through playing with the materials (Kamarainen et al., 2013; Lu & Liu, 2015). Although educational AR has been mostly used in the context of informal learning, there is some evidence that it can increase high level critical thinking (Saltan & Arslan, 2017) and enhance spatial abilities (Lin et al., 2015). In the case of laboratory settings, AR allows students to try out the technology prior to handling lab equipment, perform some experiments within the virtual world, and can lower laboratory costs (Ferrer-Torregrosa et al., 2015).
As AR transitions from an informal learning tool to a formal learning tool, it is essential that AR content generation can follow some of the traditional principles for multimedia learning contents (Mayer & Moreno, 2003), to avoid some of the typical drawbacks that come with presenting too much information. In an AR environment, students may experience a cognitive overload due to the amount of material and the complexity of tasks (Cheng & Tsai, 2013). Thus, the next step to improve the quality of AR content, is to provide well-integrated, organized, and pertinent information (e.g., images, annotations, video tutorials) to improve students’ learning performance (Chiang et al., 2014). AR can benefit from properly organizing all learning components, such as overlaid objects and videos, which can help students with improved processing of the learning content (Yoon et al., 2012). While classroom orchestration principles have been explored and tested to design an AR learning environment (i.e., integration, awareness, empowerment, flexibility, and minimalism) (Cuendet et al., 2013), there has been insufficient exploration on how the learning content itself can be structured and filtered to comply with those principles. Our work essentially decomposes complex tasks into microskills and then translates those pieces into how they align with AR technology. Further, because we are focused on emphasizing pertinent information, we investigate whether giving users partial AR content and gradually decreasing it, can improve or retain performance.

Cognitive assessment using Q-matrix theory

Cognitive assessment has surfaced as a new model of educational measurement that combines psychometric standards with the objectives of formative assessment (Haberman et al., 2008; Leighton & Gierl, 2007; Roussos et al., 2007; Templin & Henson, 2010). The focus of cognitive assessment is on specific microskills, knowledge, and other characteristics that are necessary to perform tasks which are typically selected to assess a students’ abilities. Cognitive assessment tests are customized to evaluate students’ mastery of the learning content and provide immediate feedback on their strengths and weakness; thus, determining which microskills were learned or are in need of studying (Köhn & Chiu, 2018). Each set of acquired microskills per student determines the proficiency class of the evaluated student.
The entire set of associations between items/steps and microskills is represented in the Q-matrix of a selected task (Tatsuoka, 2009). The Q-matrix must be accurate and complete, which means it must provide all possible proficiency classes of the students (Chen et al., 2015; Chiu et al., 2009; Xu, 2017; Xu & Zhang, 2016). The goal of this method is to obtain a linear system, which allows the application of standard linear Boolean algebra techniques (Desmarais et al., 2012) and infer an un-observable knowledge space (what is going on in their minds) based on observable information in students’ responses. Typically, the Q-matrix has been used to assess students’ mastery based on multiple choice questions (e.g., mathematical, reading comprehension tests) (Buck & Tatsuoka, 1998; Tatsuoka, 1983, 1985, 1990, 1995). However, it has never been utilized in the context of AR, which brings an entirely new dimension to cognitive assessment (e.g., digital data vs. the real world). While multiple-choice tests require students to engage in cognitive tasks, an educational AR technology combines critical thinking and navigation within the virtual and physical world—hands-on and “minds-on” approach. In our case, students perform psychomotor tasks in an AR environment (e.g., select, manipulate, assemble, and interact with the environment), thus our landscape spans a brain-body-environment.
In this paper, we carefully curated the decomposition of the knowledge necessary to perform a variety of electric circuitry by aligning the microskills to the AR technology. Further, we initiate key directions for how we can use the knowledge space generated to formulate a high-quality AR curricula.

Modeling

Preparing an incidence Q-matrix

A Q-matrix maps the underlying processing skills necessary to complete a task, where the columns of the matrix represent the items or steps to complete a task and the rows represent the microskills required, or vice versa. The entries in each column are given a Boolean value (true = 1 or false = 0) depending on whether that microskill is required for the solution of that step. Thus, as a Boolean matrix, the Q-matrix is subject to the assumptions and theorem of Boolean algebra which we will expand on as we develop our user studies. The user studies will aid us to exemplify the content and procedure of its formulation, and to dispel some doubts due to abstraction. In this section, we will present a simple example on a basic LED circuit (Fig. 2). This example will be represented by a 3 by 3 Q-matrix.
  • Microskill 1 (MS1): Ability to understand current flow.
  • Microskill 2 (MS2): Ability to understand polarity.
  • Microskill 3 (MS3): Ability to understand circuit connections.
  • Step 1 (S1): Connect two resistors in series.
  • Step 2 (S2): Connect LED to resistors.
  • Step 3 (S3): Connect LED(−) to battery(−) and resistors to battery( +). The explanation of the microskills are the following (Osborne, 1983; Peppler et al., 2019):
MS1: Current flow is a closed loop around a circuit with a power source (e.g., 9 V battery) and a load (something to use up the energy, e.g., an LED). MS2: Polarity is the correct direction in which connections between components are made (e.g., connect battery(−) to LED(−)) so that current can flow. MS3: Connections are defined as the joining of electrical components to form a working circuit (e.g., a bulb, battery, and wires).
$$Q = \begin{array}{*{20}l} {} \hfill & {S_{1} } \hfill & {S_{2} } \hfill & {S_{3} } \hfill \\ {{\text{MS}}_{{1}} } \hfill & 1 \hfill & 0 \hfill & 1 \hfill \\ {{\text{MS}}_{{2}} } \hfill & 0 \hfill & 0 \hfill & 1 \hfill \\ {{\text{MS}}_{{3}} } \hfill & 1 \hfill & 1 \hfill & 1 \hfill \\ \end{array}$$
The Q-matrix showing the associations between the steps and microskills can be explained as follows going column by column: Column 1. Understanding of current flow (MS1) (i.e., connecting one resistor after another so that the same current flows through each) and connections (MS3) (i.e., understanding how to add the end of a resistor to another) are necessary to connect two resistors in a series (S1), but knowledge of polarity (MS2) is not necessary for this step because resistors are not polarized (i.e., orientation of the resistors is not relevant because current flows in both directions). Thus, the microskills required for S1 are 1 and 3, which are translated to the column entries (i11, i21, i31): 1, 0, 1. Column 2. Understanding of connections (i.e., understanding how to connect an end of the resistors to an end of the LED) is necessary to know how to connect LED to resistors, because a resistor is not polarized and the current flows in both directions from the ends of the resistors in series. Thus, the microskill required for S2 is only 3, which determines the column entries (i12, i22, i32) as: 0, 0, 1. Column 3. Understanding of current flow (i.e., closing effectively the current path of the circuit with the battery, resistors and LED), polarity (i.e., connecting LED(−) to battery(−) and available end of resistors( +) to battery ( +)), connections (i.e., understanding how to connect an end of battery cap to the available end of the resistors and other end of battery cap to available leg of the LED) are necessary to know how to connect LED(−) to battery(−) and resistor to battery( +). Thus, for S3 we need microskills 1, 2, and 3, which are represented by the column entries (i13, i23, i33): 1, 1, 1.

Validating the Q-matrix

When we prepared our Q-matrix, we evaluated the microskill-step associations. However, by looking at the Q-matrix, we realize that some microskills have more value than others. For example, in our previous Q-matrix, MS3 (ability to under- stand circuit connections) is necessary for all three steps, while MS1 (ability to understand current flow) is needed for two of the steps and MS2 (ability to understand polarity) is needed for only one step. These microskills have a hierarchy among them. This hierarchy is easy to visualize because we have a small 3 × 3 matrix; however, a typical matrix will be much larger and have multiple associations. The reachability matrix (R-matrix) is a K × K matrix that represents the associations among microskills. Each row of the R-matrix represents an item that satisfies the specified hierarchical structure. We obtain the following R-matrix from our Q-matrix:
$${\text{R}} = \begin{array}{*{20}l} {} \hfill & {{\text{MS}}_{{1}} } \hfill & {{\text{MS}}_{{2}} } \hfill & {{\text{MS}}_{{3}} } \hfill \\ {{\text{MS}}_{{1}} } \hfill & 1 \hfill & 1 \hfill & 0 \hfill \\ {{\text{MS}}_{{2}} } \hfill & 0 \hfill & 1 \hfill & 0 \hfill \\ {{\text{MS}}_{{3}} } \hfill & 1 \hfill & 1 \hfill & 1 \hfill \\ \end{array}$$
We will elaborate on how to fill the entries of the first row of our R-matrix by using boolean algebra, which compares two distinct rows (microskills) of our Q- matrix. Entry i11 = 1: Parent (higher hierarchy): (1,0,1) against child (lower hierarchy): (1,0,1), this is true because this row is compared against itself. i12 = 1: Parent: (1,0,1) against child: (0,0,1), this is true because both rows do not contradict each other. i13 = 0: Parent: (1,0,1) against child: (1,1,1), this is false because parent entry contains a 0, while the same child entry is a 1, and it does not make sense that a child would possess a microskill that the parent does not.
The R-matrix is the algebraic representation of the hierarchies between microskills, and it allows us to derive a tree diagram for a graphical representation of these hierarchies. If we observe Fig. 3 (left), it is an exact representation of the R- matrix: MS3 contains itself and also is the parent of MS1 and MS2. Similarly, MS1 contains itself and is a parent of MS2. Now, if we observe Fig. 3 (right), we see the final hierarchy in order of MS3, MS1, and MS2. We erase the self-containment symbols and also disregard the direct path from MS3 to MS2 because MS2 is a child of MS1. This final tree diagram is important to check if each microskill fits in the hierarchy of valuable concepts to teach the students. This validation loop (e.g., an instructor could start by the tree diagram, then the R-matrix, and finally produce the Q-matrix) of creating Q- and R- matrices and the tree diagram enables us to compare the original and the new Q-matrices, and make any modifications to the Q-matrices if necessary.

Students’ knowledge space generated from the Q-matrix

After validating the Q-matrix, we need to collect the scores of an examination of the students’ knowledge on the material. In our case, because we are dealing with novices, we must present them with the knowledge of all the microskills prior to the test. Once they familiarize themselves with the learning contents and complete the test, we can collect their answers. To exemplify how to calculate the knowledge space, suppose that Student A scores as follows: S1 = 1 (correct), S2 = 0 (incorrect), S3 = 1 (correct). Since the student failed at S2, this means that column 2 of the original Q-matrix has changed from: 0-0-1 to 0-0-0. We refer back to our Q-matrix to calculate the value of each microskill by summing every entry of 1 in each row (MS). The mastery of each skill is the ratio of a MS value from the modified Q-matrix to a MS value from the original Q-matrix: MS1 = 2/2 = 1, MS2 = 1/1 = 1, MS3 = 2/3 = 0.66. Then, it is up to educators to decide what the cutoff value is for expertise of the students. In our case, our suggested cutoff value is 70% (0.70) (Tatsuoka, 2009), which means that any calculated expertise that falls below this value, is a microskill that needs further studying. These results mean that the knowledge space of Student A is MS1 and MS2, which means that the student is lacking MS3. We will provide the code we used to calculate the knowledge space of students. We have provided a general overview of Q-matrix theory; for more information refer to Tatsuoka (2009).

Design microskills in an AR environment

As we explained in our related work section, there is little reference on how to design the AR content for an educational curriculum, as most classroom implementations were done using an empirical approach and typically focused on how to integrate AR into the classroom, rather than how to customize the AR content itself. Thus, we decided to approach the design with an emergent coding approach (Blair, 2015), in which we clustered the types of microskills we could recognize in AR: (1) Perceptual, which refers to the time specific knowledge designed to attract the attention of the user and deliver visual information (Hoffmann et al., 2008; Kishishita et al., 2014; Lee et al., 2019; Rusch et al., 2013; Schwerdtfeger & Klinker, 2008; Steinberger et al., 2011; Volmer et al., 2018; Waldner et al., 2014); (2) Cognitive, which refers to the time specific knowledge to generate and collect information from the users’ working memory (Beheshti et al., 2017; Cai et al., 2014; Chan et al., 2013; Kapp et al., 2019; Knierim et al., 2018; Prilla, 2019; Strzys et al., 2017); (3) Motor, which refers to the time specific knowledge to properly perform an operation or process (Bhattacharya & Winer, 2019; Eckhoff et al., 2018; Gavish et al., 2015; Mohr et al., 2017; Wang et al., 2016; Webel et al., 2013; Westerfield et al., 2015). In Table 1, we go into further detail on the educational purposes for each type of microskill and guides on how to translate it into AR in terms of content design. We also provide some practical examples of AR in electronics in which the design techniques can be deployed. We anticipate that as learning content, any microskills must be accompanied by voice or text narration of the context.
Table 1
Microskills aligned as AR content. AR content design principles based on the type of identified microskill
https://static-content.springer.com/image/art%3A10.1186%2Fs41239-021-00268-9/MediaObjects/41239_2021_268_Tab1_HTML.png
Let us look at the microskills in our Q-matrix:
(1)
Current flow, can be conveyed through the animation of invisible phenomena. For example, long-format animation with electricity effects to show current, can represent this cognitive microskill.
 
(2)
Polarity, requires both understanding the direction of current and recognizing the shape of an object to indicate positive and negative terminals. For example, an AR animation to demonstrate current flowing through + and − terminals and overlaid information in the form of plus and minus signs to each terminal of the LED can represent this perceptual-cognitive microskill.
 
(3)
Understanding of circuit connections, requires manipulating components based on circuitry logic. For example, an AR interactive example can represent this motor microskill.
 
After following the design principles for what the microskills will look like, we have to determine how these will be presented to the users. In scaffolding methodology for multimedia, the technology fades away as the student completes the tasks and slowly becomes more independent. This process is a key aspect in aiding learning success (Chen et al., 2003; Hill & Hannafin, 2001; Huisinga, 2017; Marchand-Martella et al., 2013). If we select several tasks that are conducive to learning the skill (i.e., electrical circuitry), it follows that after each task, based on the student’s performance—whether each step was completed correctly or not—we can re-calculate the student’s knowledge space. This knowledge space determines which microskill the student is lacking, for example, MS3 (circuit connections). Thus, we will test two AR conditions: (1) PartialAR, which only presents the student with MS3, emphasizing on this knowledge gap; (2) Full-AR, which presents all microskills MS1, MS2, MS3, to let the student explore which AR content they want to review. Based on the design principles, we will prepare the microskills for several tasks, and based on our two AR conditions, we will evaluate our user studies.

The tasks

Electrical circuitry

Electrical circuitry was placed in an area of broader investigation as a part of the surge of interest in acquiring knowledge through a hands-on, minds-on approach (National Research Council 2012) (Council, 2012). Thus, we will use AR to encourage students to grasp the concepts "at hand" and visualize "hidden factors" (e.g., current, polarity, etc.) while making an operating circuit, and go beyond following a series of steps to build a working circuit. This is particularly prescient because misconceptions of how circuits work have been found even in undergraduates from physics and engineering courses (Fredette & Lochhead, 1980). Two of the researchers have had previous experience shadowing an IoT development course for undergraduates without previous back- ground on electronics. While some of the microskills were extracted from existing literature on elementary knowledge on electric circuits (e.g., current flow, polarity, connections, series, parallel) (Osborne, 1983, 1985; Osborne et al., 1991; Peppler et al., 2019; Shepardson & Moje, 1994), the remaining microskills were de- rived from class observation and scrapbooking (note-taking and pictures), mainly during the first five weeks of classes (3 h weekly). The two researchers, along with a learning sciences expert outlined the learning outcomes for each one of the microskills.
In Table 2, we give an in-depth explanation of the learning outcomes that we set as goals for each microskill. These microskills were selected from existing literature on basic concepts of electrical circuitry that are pervasively misunderstood (Osborne, 1983, 1985; Osborne et al., 1991; Peppler & Glosson, 2013; Peppler et al., 2016, 2019; Shepardson & Moje, 1994; Webb, 1992). The following meta-steps were not explicitly given to students, but these were meant for the researchers to prepare the general Q-matrix (Table 3) and to keep score of correct and incorrect steps by students. In such a way, after every task, we can re-calculate the knowledge space for each student.
Table 2
Microskills and learning outcomes
Microskills
Learning Outcomes
Ability to understand current flow
Understand the circular path of electrons around a circuit
Understand the difference between an open circuit and a closed circuit
Ability to understand polarity
Learn to connect components in which current flows in one direction
Learn to read polarized components, e.g., the positive (longer) leg of an LED needs to be connected to the positive terminal of the battery. Other components with polarity: capacitors, batteries, power supplies, transistors, voltage regulators
Ability to understand resistance
Understand the opposition of a component to the flow of electric current
Learn that electricity always follows the path of least resistance to ground (beware of short circuit)
Ability to understand connections
Understand the connections between one component and another, with emphasis on the terminal ends of conductivity
Learn that every component must be well connected to power the circuit (e.g., battery, bulb, and wires)
Ability to recognize components
Learn to recognize 3–5 components and their functionality from memory
Learn to read the shape and terminals of each component
Ability to understand breadboard logic
Learn to understand the governing principles of breadboard connections and parts of the breadboard
Understand how components may be inserted into the breadboard and how to connect them to each other
Ability to understand series circuits
Learn to connect components in series, in which the current only follows one path
Understand that series components are connected to follow a single path, without being separated by any branches (e.g., a string of LEDs)
Ability to understand parallel circuits
Learn to connect components in parallel, in which the current is divided into two or more paths before recombining to close the circuit loop. The voltage across every component in the circuit is similar
Understand that for two components to be connected in parallel, both ends of each component (e.g., LEDs) must be connected together
Ability to read specs sheet
Learn to read the tables or descriptions that explain the terminals and connections of each component
Understand the diagrams which will be overlaid on the component (e.g. do not use an input only terminal from a component if you require an output)
Ability to read resistor color code
Learn to read resistor values from left to right towards the golden band
Consult the color value chart to learn the resistor values from the first two colors, the multiplier from the third, and the tolerance from the fourth (golden)
Table 3
Prepared Q-matrix for all selected tasks
Steps
A
B
C
D
E
F
G
H
I
J
Microskills
          
MS1: Ability to understand current flow
0
0
0
1
1
1
1
1
1
1
MS2: Ability to understand polarity
0
0
1
1
1
1
1
1
1
1
MS3: Ability to understand resistance
0
0
0
0
1
1
0
0
0
0
MS4: Ability to understand connections
0
0
1
1
1
1
1
1
1
1
MS5: Ability to recognize components
1
1
1
1
1
0
0
0
0
0
MS6: Ability to understand breadboard logic
0
1
0
1
0
0
0
0
1
1
MS7: Ability to understand series circuits
0
0
0
1
1
0
0
1
1
0
MS8: Ability to understand parallel circuits
0
0
0
1
1
0
0
0
0
0
MS9: Ability to read specs sheet
0
0
1
0
0
0
1
1
1
0
MS10: Ability to read resistor color code
0
0
0
0
1
1
0
0
0
0

Meta-steps

A.
Locate < insert list of components > for circuit assembly.
 
B.
Place and fit < insert microcontroller type and miscellaneous component(s) > into the breadboard.
 
C.
Find and interpret specs sheet of < insert microcontroller type and miscellaneous component(s) > to identify the digital and analog connectivity pins.
 
D.
Connect < LED cathode > to ground < rail of breadboard or pin of microcontroller > .
 
E.
Connect < LED anode > to < resistor > .
 
F.
Connect < resistor > to < digital pin of microcontroller > .
 
G.
Connect < digital pin(s) or analog pin(s) or power pin or ground pin of miscellaneous component > to < digital pin(s) or analog pin(s) or power pin or ground pin of microcontroller > . Note: The complexity of this step depends on the amount of required connections between the microcontroller and the miscellaneous components.
 
H.
Connect < power, ground of miscellaneous components > to < power, ground of microcontroller > .
 
I.
Connect ground and power < pin(s) of microcontroller > to ground and power < rails of breadboard > .
 
J.
Connect ground and power < battery terminals > to ground and power < rails of breadboard > .
 
The information inside <  > can be modified depending on the task at hand; however, the general structure of the steps is similar across tasks.

Study

We recruited 20 undergraduates (55% male, 45% female), ages ranging from 18 to 34 (Mean = 23.1, SD = 2.69) to participate in our studies. All participants reported no significant background in electrical circuitry or physics (Mean = 1.25, SD = 0.43) from a 1 (novice) to 5 (expert). Participants were split into two conditions (FullAR vs. PartialAR) and each student participated in an individual session 1 (2 h) and session 2 (2 h) of the user study. We scheduled each student for session 1 and 2 exactly one week apart from each other.
The microskills were delivered using AR technology as the fundamental knowledge that were required to complete the tasks, and which could be accessed at any time by the participants during the sessions. Apart from the two interactive examples (AR tutorials), which provided a series of procedural AR animations on how to assemble a working circuit, there were no additional instructions provided to students. Prior to each task, the researcher provided the students with a description of the outcome for each task (Fig. 4). For example: "You need to set up a circuit in which you use your ESP32 (microcontroller) so that every time you press down on your pushbutton, you turn on the LED". Every microcontroller had the uploaded code for the task and the specs sheet provided for each component contained the pin numbers from the microcontroller that had to be used.
First session for PartialAR condition was as follows: Students started by exploring all 10 microskills + interactive example 1, followed by a test (Task 0), then once each student’s knowledge space was calculated, we exposed the participants to the microskills found lacking as they performed Task 1. For the FullAR group, similarly, participants started by exploring all 10 microskills + interactive example 1, followed by Task 0, then we again gave them access to all the microskills as they performed Task 1. For a detailed flowchart, see Fig. 5.
Second session session for PartialAR condition was as follows: Prior to every task we re-calculated the new knowledge space of each participant and provided participants with the customized AR based on the microskills that were found to be lacking. For the FullAR group, participants performed Tasks 2–8 with all 10 microskills made available at each task.
The tasks and interactive examples presented to students were in the following order:
Session 1: Interactive example 1: Turn on LED when pushbutton is pressed down. Task 0: Turn on LED when ultrasonic distance sensor detects an obstacle (e.g., a hand) at a certain proximity. Task 1: Turn on LED when distance calculated by obstacle detector sensor and an obstacle (e.g., a hand) falls below a threshold.
Session 2: Interactive example 2: procedural instructions for Task 0. Task 2: Turn on LED when color detector sensor detects a green object in its path. Task 3: Turn on LED when the temperature detected by the humidity and temperature sensor reaches a threshold. Task 4: Control the intensity of the LED using the potentiometer. Task 5: Turn on LED and display a message on the LCD screen (e.g., “Hello World”). Task 6: Turn on LED when joystick is pressed down. Task 7: Connect three 100 Ohms resistors in series to sum up to a resistance of 300 Ohms, then use the pushbutton to turn on LED when pressed. Task 8: Connect four 1 kOhms resistors in parallel to lower the resistance to 250 Ohms, then use the pushbutton to turn on LED when pressed. Note that the microskills available for studying were available throughout the tasks depending on the AR condition (Fig. 6).

Results

Keeping score during the tasks

In order to re-calculate the knowledge space, the researchers took note of whether each student had completed each step correctly or not. Each step performed correctly adds a 1-point score to a participant’s total. We performed a one-way ANOVA test to compare the means between the two conditions (Full AR vs. Partial AR) on two sessions (1st session vs. 2nd session). There was a statistically significant difference between the two conditions as determined by one-way ANOVA (F(3, 36) = 49.61, p = 0.00). A Tukey post hoc test revealed that the average score—out of 10 points, which represents 10 microskills—for the PartialAR was statistically higher for the second session. There was a statistically significant difference between FullAR-1st session (3.7 ± 1.55) and PartialAR-1st session (5.7 ± 1.27) groups (p = 0.002), with the PartialAR condition enabling students to outperform the FullAR condition. We also determine statistically significant results between FullAR-2nd session (7.98 ± 0.51) and PartialAR-2nd session (9.34 ± 0.47) groups (p = 0.04). We found the PartialAR condition presented to students in the form of their re-calculated knowledge space enabled statistically significantly overall higher performance than FullAR in both the first and second sessions.

Assessment by microskill

We wanted a breakdown assessment of the participants’ performance for each microskill, to determine which microskills they found the most difficult, and whether these matched our observations. Our overall breakdown of their average score per microskill (MS) is as follows: MS1 = 9.94 ± 0.17, MS2 = 9.44 ± 1.16, MS3 = 9.89 ± 0.33, MS4 = 7.63 ± 2.16, MS5 = 8.44 ± 1.70, MS6 = 6.75 ± 2.96, MS7 = 8.06 ± 2.03, MS8 = 8.31 ± 1.83, MS9 = 8 ± 2.49, MS10 = 9.25 ± 1.26. We compared the lowest score of the two skills by performing a paired t-test between MS4 and MS6. MS6 was statistically significantly more difficult than the population normal performance score for all tasks, t(15) = 2.21, p = 0.02. We found no statistically significant difference between the following bottom two: MS6 and MS7 (p = 0.22). This is consistent with our observations that breadboard logic was the most difficult microskill, as the most common mistake took place when students would hesitate or get confused on how to ‘close’ the power and ground of the circuit in the power rails.

Think-aloud understanding of circuitry

Following the skilling part of our first sessions in which we presented the students with all relevant information, we deployed the think-aloud method (Olson et al., 2018) to evaluate the thought process and logic used to complete different circuit tasks. We repeated similar questions at the end of the first session and at the end of the second session. One of the researchers conducted the majority of the transcription, while another researcher coded 40% to achieve inter-reliability. There was moderately strong agreement between both of the researchers’ judgements, κ = 0.773 (95% CI), p < 0.0005.
The following are snippets of a conversation carried out between Researcher 1 (R1) and Participant 9 (P9) during the assessment part (task 2) of session 1:
  • R1: Do you have a sense of what your closed circuit will look like? What will happen?
  • P9: At the end of the circuit? I’m going to connect it to the < ultrasonic distance > sensor, and if all is well then the light is going to turn on (inserts resistor into the breadboard) R1: Yes, that’s the idea. Do you have a sense of why you are using a resistor in your circuit?
  • P9: To try to lessen the electricity that goes to the light, to avoid breaking the light (points to LED in breadboard).
  • R1: Do you have a sense of what the ends of the LED are telling you?
  • P9: Smaller part is the cathode and the longer part is the positive part. R1: Do you have an idea of how to connect your sensor to the board?
  • P9: Not too much, but I have to try to have the electricity go through all the board. I’m just not sure how to connect it, I guess (participant proceeds to multiple trials to connect the circuit).
  • R1: Is your circuit closed? Why?
  • P9: I don’t know…This is it? (participant hands it over to researcher).
Most participants still had many questions about the content after the first session, but the second session concluded with participants being capable of providing proper, coherent responses about their circuits. We will expand on these observations in the Findings section. For example, the following are snippets of a conversation carried out between Researcher 1 (R1) and Participant 15 (P15) towards the end of session 2 (task 8):
  • R1: So do you have a sense of how a closed circuit looks like?
  • P15: I have to go from positive charge to a negative charge. So I always know that I have to go from the power to the ground and everything has to be connected so that it will light up the LED…(explains her circuit in much greater detail).
  • R1: Do you know why we were using the resistor in the circuits? (points to the resistor in the board).
  • P15: So I know that < the resistor > controls the current, so, like, it would make sense to regulate how much current gets through and not break the LED. (points to the current going from ESP32 to resistor to LED).
  • R1: Do you know what the LED having a long side and a short side mean?
  • P15: Yeah, this shows the polarized sides, so that the long side shows the positive side and the negative side goes to ground–negative side goes to ground, positive side goes to power or load (holds ends of the LED and spreads them with hand).
  • R1: How do you check that your circuit is done? (no load is applied yet).
  • P15: I would make sure that if I have a sensor—like the color < sensor > —, have to make sure it goes to the pins, and so like, these pins < from sensor > go to these pins of the ESP32, then the ground or the power from that sensor is on the board for the positive and negative charge, and then I make sure that the LED starts from the resistor. So I make sure that everything has current. I think of it as a circle that I need to close. (points to all components in breadboard one by one).

Post-tasks multiple-choice examination

At the end the second session, we decided to test the students with a multiple-choice questionnaire, in order to evaluate their understanding of each microskill. The test included 10 questions, in which each question was meant to target one or more microskills. We compared the average score between the two conditions by performing a two-sample t-test assuming unequal variances and we found that there was no statistically significant difference between both groups, t(13) = − 0.412, p = 0.34. For example, some of the questions included: choose the schematic of a working circuit, choose the functionality of a resistor, read the value of the following resistor, which of the following is true about this series circuit?. We found that participants score for both conditions was higher than expected (70% cutoff), scoring an average of 8.8 ± 1.49 for the FullAR condition and 9.03 ± 0.69 for the PartialAR condition out of the 10 points for the questionnaire. This means that as students got more access to AR, the difference between conditions disappears.

Qualitative and quantitative findings

Adoption of a new vocabulary as evidence of learning

Building a circuit does not necessarily translate to understanding concepts, which is why we used the think-aloud method to follow and gain insights into students’ learning process. Researchers noticed that as students became more exposed to the concepts of electrical circuitry, they became more articulate and began adopting words they had no familiarity or use for, previously. After the first session, students had somewhat vague ideas about the concepts recently introduced and that was also reflected on how they answered the questions. Participants used vague words such as ‘thing’, ‘energy’, ‘light’ or pointed to objects to talk about the components, concepts they wanted to explain or often said that they were unsure of what was going on. For example, they phrased their statements as ‘I think that the resistor is used for…’ (P3) or responded a question with another question, such as ‘Yes, I kind of remember…what is the name of this?’ (P16, referring to the ESP32). Since this was an assessment session, we were not expecting them to fully under- stand or internalize the microskills, but it was useful to compare their answers to the knowledge space we calculated for each student. Students were found to be lacking several microskills (especially cognitive), which meant they needed studying more of the AR content.
Then towards the end of the second session, once participants had a chance to become familiar with their circuits and AR environment, we asked questions and told participants to walk us through their logic. The researchers observed that as participants successfully completed all the tasks, they also gained fluency on the concepts and the objects they were manipulating. For example, they adopted words like ‘voltage’, ‘closed loop’, ‘charge’, ‘current’, ‘anode’, ‘cathode’. Another important development was that as the participants became fluent with the new vocabulary and concepts, they were capable of faster troubleshooting of their circuits. For example, the most common mistakes throughout the tasks were related to breadboard logic (MS6), as participants would often forget to close the loop by connecting power or ground terminals to obtain their working circuits. Upon trying and failing to power their circuits, most participants first instinct was to check these types of connections.

Improvement of the AR content

Following the first assessment session, we were able to pick up on participants’ first impressions on the AR technology. Participants found AR to be useful and wanted to explore it to further understand electrical circuitry. We questioned them on what they liked and did not like from the AR content:

Occlusion and misalignment control

Some participants raised concerns about the breadboard shader (i.e., the virtual breadboard superimposed on the physical breadboard), because it occluded the physical breadboard and their hands, which made confusing to follow along the interactive examples (connections). Also, electrical components are quite small, which means that the object tracking in AR is not as accurate as it would be with larger objects. While the tracking accuracy using QR codes only presented minor misalignments, when combined with the shader occlusion, it enabled more mistakes during the examples because participants could not follow and match the pins. Thus, prior to the second session, we used some techniques to bypass these issues. For example, we created an invisible shader to keep a virtual model in which the components would fit—but would not occlude the hands—and we also added the symbology of the power rails and the numbers and letters typical to a breadboard (Fig. 7). Then, we used AR to project the pin numbers of a component (e.g., resistor to pin D23 of ESP32) in large letters. Another way to go around any confusion, was to encourage users to explore the zoom functionality of the AR technology in which they could simply read the letters and pins from components and match them during assembly, however the importance of matching specific pins between components was not obvious until we emphasized the name or number of each pin. These new design schemes were helpful to participants during session 2 and eliminated errors during the interactive examples, which were important to understand breadboard logic and connections.

Interactive AR is better than embedded video

We had decided to provide one interactive example per session to enable participants to explore connections between components and how to manipulate them. These examples were considered complementary to further internalize the ability to understand connections, which was already explained in an embedded AR video. However, based on participants’ responses, we learned that these examples were essential rather than complementary, because participants understood connections only after following along and building a working circuit and manipulating components with their own hands. Thus, we needed to make sure that the interactive examples were easy-to-follow and that participants could explore electrical phenomena and the components. For example, we had to play with the transparency of the components, so that too many wires would not occlude each other and we only kept the terminal ends of the wires to not confuse the participants. This type of 3D object exploration is particular to AR technology and participants preferred being able to explore the components in this way.
Voice narration was key and analogies worked best for complicated concepts. According to participants’ responses, voice narration—which accompanied every microskill—was useful to provide long format context and explanation of the different concepts, and requested it to be included in the interactive examples for the second session. Also, analogies were described as extremely useful to understand new concepts. For example, several participants brought up how helpful it was using a water flow analogy to relate it to current flow (see Table 1), and how analogies helped them think of electrical circuitry in their own terms (e.g., a circuit as a circle).

Full AR vs. partial AR

As observed in the results section, partial AR enabled participants to have a superior performance in their overall score. Participants with full AR had access to all the microskills—even the ones they had already mastered—which typically meant that although participants could freely explore all the microskills, they were lost as to what specific knowledge they were missing since it was not emphasized among all the information. The group with PartialAR showed overall superior performance through their access to targeted microskills, which meant that after every task, they were directed to exactly the knowledge they had missed. However, as both groups continue exploring the learning content and completing more tasks, the difference between their scores (i.e., the gaps in their knowledge spaces) becomes insignificant as most students successfully finished the last task with almost no errors, and this is also observed in their written examinations (post-tasks). Thus, we can determine that PartialAR—scaffolded AR based on the missing gaps of participants’ knowledge spaces—can be particularly beneficial at the beginning of the learning process, as participants struggle to acquire new knowledge.

Aligning the microskills to AR design principles

We leveraged the expertise of the researchers—who were previously involved in electrical circuitry classes and workshops—to carefully select the microskills necessary to fulfill the variety of circuitry tasks. This part of the process is fundamental to create a Q-matrix, map the associations among the microskills and steps, and to validate the hierarchies among the microskills. The results showed that the microskills were accurate and sufficient by obtaining a high average score M = 8.96 for all participants. In order to decide how to best represent the microskills in AR, we referred to Table 1 to select whether the microskills were perceptual, cognitive, motor, or often a combination of these. For example, recognize components was best exemplified by highlighting each component on the breadboard (perceptual); current flow—which can be considered an invisible electrical phenomena—was best represent in long format by an animation with electrical effects (cognitive); connections required manipulating components based on circuitry logic motor, and we concluded that an AR embedded video followed by an interaction example worked best to educate the students. Our listed AR content design principles from Table 1 are not meant to be binding, but meant to be used as a guide to de- liver learning content to the students. We suggest considering those techniques which are coded specifically to deliver small segments of information—microskills—to the students.

Achieving learning outcomes in AR

Each microskill we selected was accompanied by at least two learning outcomes. Selecting learning outcomes for each microskill is not part of Q-matrix theory which generally determines the students’ knowledge space based on performing correctly each step of the task. However, setting achievable goals for each microskill allows us a concrete metric to test the knowledge of each student. In the case of the multiple-choice examination, we designed each question to address the learning outcomes of acquired knowledge we expected them to have. For example, one of the questions asked the students about the names in a list of 6 components. Every participant answered the question correctly and the overall average score for all participants was quite high.

Limitations in our experiments

Our experiments handled a relatively small sample size from an undergraduate population at a US university. We would need a much larger and diverse population to obtain a conclusive list of microskills that would be sufficient to enable novices to obtain the basic skill of electrical circuitry. However, the results were quite promising across tasks and examinations, and the authors would like to encourage similar experiments to be conducted in order to use our list as part of an electrical circuitry curriculum. Also, our model could potentially be applied to other multimedia successfully (e.g., video tutorials, 2D animations), which do not necessarily need to be embedded into an AR environment. However AR is a particularly useful tool capable of improving performance and spatial skills for highly spatial tasks (e.g., assemblies, connections, repairs), and we also observed from our own experiments that embedded video was not as effective as AR in order to explain some concepts, and that participants only learned them by making their circuits. When deciding whether AR is the right useful tool for a classroom, it is important to carefully analyze if the selected educational tasks would benefit from the use of AR.

Future work and potential of AR technology

We want to implement an AR-based curriculum for the next iteration of the electric circuits and IoT development course for undergraduates, in which two of the researchers will be instructing. Our workflow will be used to bring the novices to an elementary knowledge of electrical circuitry. This was one of the reasons we chose to use phone-based AR, so that we can make the learning material scalable and accessible to the students even prior to class or to long distance students. The first few iterations of this curriculum will be considered experimental, but it will help us continually refine the curriculum and the tools we will be using to teach the novices. Similarly, it would be interesting to see our workflow implemented in other subject areas (e.g., physics, chemistry, biology, etc.).

Conclusion

In this paper, we presented the use of Q-matrix theory as a design framework to develop an AR-based curriculum. This workflow systematically implements AR learning content using cognitive assessment into an education curriculum, in our case for mastery of basic electrical circuitry. Thus, we provided a list of suggested design principles to be used as a guide to deliver AR educational content. We evaluated the association between microskills—the smallest segment of knowledge—and steps, to complete diverse and complex tasks. In our evaluation, we demonstrated that scaffolded AR worked better when students were recently introduced to the novel concepts. In order to prove the learning of electrical circuitry in our participants, we used three types of evaluations: quantitative scores taken from each completed task, think-aloud method to follow their acquisition of new vocabulary and learning process, and a written examination (after second session) to verify their understanding of circuitry concepts. Thus, we proved that our workflow effectively leads to novices acquiring basic knowledge of electrical circuitry. Finally, we demonstrated that aligning the AR technology to specific learning objectives paves the way for high quality assessment, teaching, and learning.

Acknowledgements

We wish to give special thanks to Yeliana Torres and Kaiwen Li for their help with figures and testing.

Declarations

Purdue University Institutional Review Board has approved the study “Learning and Training Applications Using Augmented Reality” IRB #1906022313.
Authors certify that the text and any pictures or videos published in the article will be freely available on the internet and may be seen by the general public. The pictures, videos and text may also appear on other websites or in print, may be translated into other languages or used for commercial purposes.

Competing interest

The authors declare that they have no competing interests.
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Appendix

Supplementary Information

Additional file 1. Supplementary video explaining our paper.
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Metadata
Title
Towards modeling of human skilling for electrical circuitry using augmented reality applications
Authors
Ana Villanueva
Ziyi Liu
Yoshimasa Kitaguchi
Zhengzhe Zhu
Kylie Peppler
Thomas Redick
Karthik Ramani
Publication date
01-12-2021
Publisher
Springer International Publishing
DOI
https://doi.org/10.1186/s41239-021-00268-9

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