The HAAT model (Cook and Hussey, 2002) was developed to analyze the complexities of someone (a person with a disability) doing something (an activity) somewhere (within a context), especially when the use of assistive technology is part of that context. It is based on the human performance model (Bailey, 1989) which is often used by human factors engineers and psychologists in the design and application of technology. http://www.teachingat.info/constructs/human.html
This text provides detailed coverage of the broad range of devices, services, and practices that comprise assistive technology and focuses on the relationship between the human user and the assisted activity within specific contexts.
Here is a link to a pdf file that provides an explanation of the HAAT model along with a diagram to clarify the process.
http://assistivetech-4alllearners.wikispaces.com/file/view/HAAT+model+info.pdf
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