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SUMMARY:Modelling user interfaces for special needs - Pradipta Biswas\, Ra
 inbow Group
DTSTART:20080403T131500Z
DTEND:20080403T141500Z
UID:TALK11406@talks.cam.ac.uk
CONTACT:Peter Robinson
DESCRIPTION:Computers offer valuable assistance to people with physical di
 sabilities. \nHowever designing human-computer interfaces for these users 
 is complicated. \nThe range of abilities is more diverse than for able-bod
 ied users\, which makes analytical modelling harder. Practical user trials
  are also difficult and time consuming. We are developing a simulator to h
 elp with the evaluation of assistive interfaces. It can predict the likely
  interaction patterns when undertaking a task using a variety of input dev
 ices\, and estimate the time to complete the task in the presence of diffe
 rent disabilities and for different levels of skill.\n \nThe simulator is 
 developed according to the concept of Model Human Processor. It consists o
 f a Perception model\, a Cognitive model and a Motor-Behaviour Model. The 
 perception model simulates the phenomenon of visual perception (like focus
 sing and shifting attention). It can reproduce the results of previous exp
 eriments on visual perception in the context of Human-Computer Interaction
  and can also simulate the effects of different visual impairments on inte
 raction. The cognitive model uses CPM-GOMS model to simulate expert perfor
 mance. It also has a novel and easy-to-use module to simulate performance 
 of novices based on the concept of dual-space model. Finally the motor-beh
 aviour model is developed by statistical analysis of cursor traces from mo
 tor-impaired users. We have already used this simulator to design and eval
 uate a new interaction technique (a single-switch scanning approach based 
 on clustering screen objects) of assistive interfaces.\n
LOCATION:Computer Laboratory\, William Gates Building\, Room SS03
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