Evaluation of computer access systems for students with multiple and severe physical handicap : using replicated single-case experimental design with ISO9241-9

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Evaluation of computer access systems for students with multiple and severe physical handicap : using replicated single-case experimental design with ISO9241-9

 

Author: Wong, Mei-sheung Louisa
Title: Evaluation of computer access systems for students with multiple and severe physical handicap : using replicated single-case experimental design with ISO9241-9
Degree: M.Sc.
Year: 2004
Subject: Hong Kong Polytechnic University -- Dissertations
Computers and people with disabilities
Self-help devices for people with disabilities
Adaptive computing systems
User interfaces (Computer systems) -- Design
Department: Dept. of Rehabilitation Sciences
Pages: xi, 102 leaves : col. ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1800282
URI: http://theses.lib.polyu.edu.hk/handle/200/5402
Abstract: Today, most people can access the information world just as simply as moving fingertip only. The universal and user friendly design allows most people to access computer with many possible solutions, even though some of them may have visual, hearing, and/or mobility impairment (Microsoft, 2004). But it is not totally the reality in clinical practice that some people with multiple physical handicap are not able to access either the hardware or the software, thus diminishing their opportunity in communication and learning. This research was a replicated single-case experimental design (ABCD) to compare the performance of four students with multiple physical handicap in using four computer access solutions: A = Camera Mouse, B = Adaptive Switches Laboratory mouse emulator, C = Cross Scanner, and D = Quick Glance Eye Mouse. The purpose of this study was to evaluate the effectiveness of different interface systems by comparing their rate of output in terms of speed and accuracy which was evaluated and computed by the ISO9241-9 WinFitts Test (multi-directional point-and-click task). Also, level of comfort (ISO924l Annex C) of participants to each of the interface system was evaluated by the end of all trials. Undergoing the WinFitts test, statistically significant differences were found among systems: (1) Cross Scanner showed the highest rate of accuracy, (2) Camera Mouse and ASL showed better performance in speed, (3) Participants rated Cross Scanner at the highest degree of comfort, and (4) Correlation matrix of human factors and system factors found that Cross Scanner was the best selection of computer access system for the participants in this study. Conclusively, there were three special access systems that could go through the WinFitts test. Then these systems might perform like a usual mouse which allowed students with multiple and severe physical handicap to access the universal design of computer applications without adaptation. There were three scopes of discussion concerning the decision process of matching human factors and systems factors for computer access solution. Firstly, advantage and drawback of existing computer access interface; secondary, prototype of the evaluation procedure of special computer access solutions for students with multiple and severe physical handicap; and thirdly, new items for the assessment of comfort. Finally, this within-subjects experimental study provided a stable and self-controlled setup for system evaluation so that it may be replicated and generalized the procedures of ISO9241-9 test as well as the results for further clinical experimental research of computer access systems.

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