Models for AT

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What are AT's?
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Models for AT
Week 3 Assignment


C.  Models of AT, Functional Needs, & Human Performance

HAAT Model: Human Activity Assistive Technology

"System" that includes human and AT

"Activities" -- Recognize/specify the Need (or desire)

Activities determined or related to life roles

Activity accomplished by completing a set of tasks

Activity carried out within a context

Human as "Intrinsic Enabler"

"Human operator" with underlying abilities to perform activities/tasks

Classification into:

Sensory input, central processing, effectors

central: perception, cognition/memory, motor control (p. 82)

Ex for motor control (p. 123): Speed-accuracy tradeoff (Fitts' Law), reaction times

"Ability" as basic trait a person brings to a new task

skill is a level of proficiency (in performance)

"Learning" often involves breaking activity into tasks to master

Basic performance areas: self-care, work/school, play/leisure

AT's as "Extrinsic Enablers"

Interaction via "Human-Technology Interface"

Ex: Seating/positioning devices; Control interface; Displays, ...

AT "Processors"

Augmentation or Replacement of "Activity Outputs"

Environmental Interface (i.e., "HAAT System" boundary)

Design "Process"

Access needs, goals (related to desired activities), skill

Determine AT system characteristics

Conceive design plan, system

develop/deliver (and perhaps provide training)

Design "Outcomes"

Becoming more and more a critical "driver" of service delivery

Effectiveness - impact of "product" on consumer's life & needs ("Does it work?")

Efficacy - ability of produce a desired result or effect ("Can it work?")


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Last updated: January 30, 2001.