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This paper describes an on-going effort in building user-centric automation and assistive devices from workflows. Advantages of this approach include that workflow-based devices and systems are naturally componentized and easily configurable. Models of a new device, user actions and users defined in terms of activities and workflows are executable. The authors can use them to simulate the device and its interactions with the user for requirement capture and design purposes. Later on in the development process, programs and other resources required by the device workflows become available.
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