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. Author manuscript; available in PMC: 2016 Jan 18.
Published in final edited form as: J Rehabil Assist Technol Eng. 2015 Dec;2:10.1177/2055668315594076. doi: 10.1177/2055668315594076

Table 1.

Key Design Requirements
Inclusive design usable by people with a range of mobility impairments, including those with wheelchairs and walkers
Is “always available”, i.e. doesn’t need to be called from another floor
Provides the option for users to use stairs
Stair tread rise to run ratio consistent with current building codes
Form factor that allows aesthetic integration with North American bungalow homes
Potential for a self-powered version (i.e. no external power required)
Usable for emergency descent in absence of power