Introduction
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Lazy Start: the success rate of the first question is not very high
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Tight-Placed Errors: the number of correct answers to the questions is decreasing if they are placed too tightly one after another
Related work
Methodology
Interactions in learning-videos and context
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Simple questions
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general questions which are not related to the content of the video
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random and automatic
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used to provide interactivity if there is no content-related question
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Solve CAPTCHAs
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a CAPTCHA is displayed in the same way and for the same reasons as the simple questions
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Ask teacher
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students are able to ask a question to the teacher by using an offered text box
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the teacher could answer per e-mail or by using an offered dialog
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Text-based questions
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the teacher could ask text-based-questions to the students
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at a live broadcasting of a lecture he can ask a question instantly by entering it in a text box
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at an on-demand video he can place the question at a specific position before releasing the video
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Multiple choice question
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real multiple choice questions or true-false questions
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the teacher could add these questions at pre-defined positions in the video
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Report technical problem
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students are able to report a technical problem
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mainly used at live broadcastings of lectures if there are problems with the video stream
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watched timespans of each student
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the number of users and views per second
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answers to the different types of questions
Case study
Study environment
Setting of the questions
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1.5 minutes: used in 2 videos
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2 minutes: used in 2 videos
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2.5 minutes: used in 3 videos
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3 minutes: used in 4 videos.
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after 1 minute: used in 3 videos
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after 2 minutes: used in 3 videos
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after 3 minutes: used in 3 videos
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after 4 minutes: used in 2 videos.
Results
Data concerning different interval lengths
Data concerning time of the first occurring question
Contrast between first and remaining questions
Long-term effects of the learning videos on students
Grades | 1 | 2 | 3 | 4 | 5 |
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Class A | 2 | 5 | 6 | 3 | 4 |
Class B | 0 | 1 | 7 | 3 | 8 |