Developing a methodology for the design of accessible interfaces

Users with a number of different motion impairment conditions cannot cope with most current computer access systems. Such conditions include athetoid, ataxic and spastic Cerebral Palsy, Muscular Dystrophy, Friedrich’s Ataxia, tetraplegia and spinal injuries or disorder. Frequent symptoms include tremor, spasm, poor co-ordination, restricted movement, and reduced muscle strength. Similar symptoms are also seen amongst the elderly able-bodied population from conditions such as Parkinson’s Disease, strokes and arthritis. The primary aim of the programme of research at the University of Cambridge is to enable the design of accessible input systems and interfaces for all motion-impaired users, both elderly and disabled. Current interface design practices are based on user models and descriptions derived exclusively from studies of able-bodied users. However, such users are only one point on a wide and varied scale of physical capabilities. This paper will show that there are very important differences between those with motion-impairments, whether elderly or disabled, and able-bodied users when they interact with computers. Without a proper understanding of those differences, interface design will remain an exercise in making the interfaces more comfortable for the motion-impaired users, rather than really usable. This paper describes our experiments to understand how motion-impaired users interact with computers and how we are using this information to develop a methodology for the design of accessible interfaces.

[1]  M. R. Harter,et al.  Excitability cycles and cortical scanning: a review of two hypotheses of central intermittency in perception. , 1967, Psychological bulletin.

[2]  Shumin Zhai,et al.  The influence of muscle groups on performance of multiple degree-of-freedom input , 1996, CHI.

[3]  Christian Bühler,et al.  Robotics for rehabilitation — a European (?) perspective , 1998, Robotica.

[4]  Thomas G. Whisenand,et al.  Analysis of Cursor Movements with a Mouse , 1997, HCI.

[5]  Christian Stary,et al.  DESIGN AND EVALUATION OF THE USER INTERFACE OF FOREIGN LANGUAGE MULTIMEDIA SOFTWARE : A COGNITIVE APPROACH , 1998 .

[6]  Simeon Keates,et al.  User modelling and the design of computer-based assistive devices , 1997 .

[7]  Constantine Stephanidis,et al.  Embedding Scanning Techniques Accessible to Motor-Impaired Users in the WINDOWS Object Library , 1997, HCI.

[8]  Amaresh Chakrabarti,et al.  A design research methodology , 1995 .

[9]  Pj Clarkson,et al.  The use of prototypes in the design of interactive machines , 1997 .

[10]  Christine L. MacKenzie,et al.  Physical versus virtual pointing , 1996, CHI.

[11]  Ephraim P. Glinert,et al.  MultiModal Multi-Interface Environments for Accessible Ubiquitous Computing , 1997, HCI.

[12]  Arthur I. Karshmer Interdisciplinary Efforts to Facilitate the Production of Tools to Support the Disabled and Elderly in the Information Society , 1997, HCI.

[13]  Constantine Stephanidis Towards the Next Generation of UIST: Developing for all Users , 1997, HCI.

[14]  Allen Newell,et al.  The psychology of human-computer interaction , 1983 .

[15]  Geoff Busby Technology for the disabled and why it matters to you , 1996, IFIP World Conference on IT Tools.

[16]  Peter Robinson,et al.  The use of gestures in multimodal input , 1998, Assets '98.