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2014 | OriginalPaper | Buchkapitel

2. Quality and Quality of Experience

verfasst von : Alexander Raake, Sebastian Egger

Erschienen in: Quality of Experience

Verlag: Springer International Publishing

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Abstract

The chapter discusses the processes of human perception and experiencing, and of quality formation. In this context, definitions of relevant terms are re-visited and adapted to the presented, updated view, and different aspects of research into quality at large and into Quality of Experience are summarized. Using a conceptual model, the quality formation process is analyzed in view of different contexts and tasks, such as taking part in a quality test under controlled conditions, experiencing a video presentation or concert, or exploring a system or device when considering a purchase in a shop. We provide a short overview of different quality assessment methods, and outline related trends in QoE research.

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Vorheriges Kapitel Motivation and Introduction

Nächstes Kapitel Quality of Experience Versus User Experience

The authors of this chapter have been the corresponding authors for Chaps. 2 and 3 of the Qualinet White Paper on QoE. The present chapter is an updated and more in-depth consideration of the quality and QoE concepts.

It must be noted that the engineering, computer science and networking communities sometimes still use “QoE” in a misleading way in terms of technological aspects that are likely to impact QoE as perceived by users, without actually assessing or quantifying QoE or the QoE impact. For further discussion of QoE and service performance in terms of Quality of Service (QoS) see Sect. 2.2 and especially Chap. 6.

It is noted that in case of experiencing as it may, for example, happen during dreams, or processes of thinking, conception or design, parts of the sensory information are replaced by sketches from memory. This type of experiencing is explicitly excluded here.

Note that “utility” and “utility function” also are central terms in micro-economics, however referring to the mapping of a resource to the value for a customer. Economic aspects related with QoE are further discussed in Chap. 7.

Of course quality-related assumptions may be associated with sensory or emotional references, too.

Note that in our view presented here, experiencing is the process, which however is evaluated in terms of the features associated with the perceptual events happening during that process. Here, it is interesting to note that the German translation of quality of experiencing or “quality of experience” as used by Kahneman is Qualität des Erlebens, which explicitly reflects that experiencing is a process.

Initial works on Gestalt-theory are those by its founders Wertheimer [61, 62] and Koffka [31]. Its use in, for example, auditory scene analysis has been discussed in detail by Bregman [10].

According to Jekosch, “controlled” perception can be distinguished from “random” perception/ quality assessment. Here, natural experience(ing) without a dedicated quality judgment task, for example, corresponds to “random”, and task-driven quality assessment to “controlled”.

This also includes whether perceived quality is currently relevant for the customer for acceptability.

Often referred to as “subjective”, a somewhat misleading term avoided here.

Often referred to as “objective”, which is even less appropriate than “subjective”, since it implies that instrumental measurements bear objectivity, which they only do in case that they can be generalized.

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Titel: Quality and Quality of Experience
verfasst von: Alexander Raake
Sebastian Egger
Verlag: Springer International Publishing
Buch: Quality of Experience
Print ISBN: 978-3-319-02680-0

Electronic ISBN: 978-3-319-02681-7

Copyright-Jahr: 2014
DOI: https://doi.org/10.1007/978-3-319-02681-7_2