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"Transgenerational design is design for all ages and for all abilities," says Pirkl. "If a teenager sprains his ankle, he's disabled for a while. If a woman gets pregnant, her mobility is temporarily affected. We all have some level of disability during our lives. No design will serve 100 percent of the people 100 percent of the time, but we're trying to make sure no one group is excessively penalized by the design."

http://www.aarpmagazine.org/interactive/Articles/a2003-08-28-house_tour.html