Information Technology Reference
In-Depth Information
Chapter 1
Instrumented Usability
Analysis for Mobile Devices
Andrew Crossan
University of Glasgow, Scotland
Roderick Murray-Smith
University of Glasgow, Scotland & National University of Ireland - Maynooth, Ireland
Stephen Brewster
University of Glasgow, Scotland
Bojan Musizza
Institut Jozef Stefan, Slovenia
ABSTRACT
Instrumented usability analysis involves the use of sensors during a usability study which provide
observations from which the evaluator can infer details of the context of use, specific activities or
disturbances. This is particularly useful for the evaluation of mobile and wearable devices, which are
currently difficult to test realistically without constraining users in unnatural ways. To illustrate the
benefits of such an approach, we present a study of touch-screen selection of on-screen targets, whilst
walking and sitting, using a PocketPC instrumented with an accelerometer. From the accelerometer
data the user's gait behaviour is inferred, allowing us to link performance to gait phase angle, showing
there were phase regions with significantly lower error and variability. The article provides examples of
how information acquired via sensors gives us quantitatively measurable information about the detailed
interactions taking place when mobile, allowing designers to test and revise design decisions, based on
realistic user activity.
INTRODUCTION
is a correspondingly large activity in the design of
interaction for these devices. It is obviously very
important to be able to evaluate their usability, but
by their very nature, these devices are intended
for use in mobile settings, not for use by someone
seated in a usability lab.
Mobile and wearable devices are becoming in-
creasingly important in our daily lives, and there
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