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| | Design Principles |
 | | A ramp, provided for the same purpose, only presupposes the ability to move forward, something that can be done by walking or by using an ordinary wheelchair. |
 | | It is important to do this because moving point to point is an accomplishment that interfaces with many other accomplishments and more broadly with many other methods, but not with that of moving between floors, at least not if all that is provided at a location are stairs. |
 | | With a ramp, moving point to point is an accomplishment that interfaces with the desired accomplishment; it became of way of moving between floors and thus part of a method for, e.g., hand delivering memos to one's boss. |
| www-csli.stanford.edu /~john/disabilities/prolegomena/node4.html (1815 words) |
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