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Hi Maria It depends what kind of comparison you want. My doctoral research compared the relative economic value of ramps, lifts and stairs in a railway setting, but not the relative usability directly. You could argue that the usability is to an extent reflected in the economic value that people place on the different forms of access.... https://dspace.lib.cranfield.ac.uk/handle/1826/2046 Alice (Maynard) ________________End of message________________ This Disability-Research Discussion list is managed by the Centre for Disability Studies at the University of Leeds (www.leeds.ac.uk/disability-studies). Enquiries about list administration should be sent to [log in to unmask] Archives and tools are located at: www.jiscmail.ac.uk/lists/disability-research.html You can VIEW, POST, JOIN and LEAVE the list by logging in to this web page.