-design to fit all ----design for adjustability ----provide different sizes -design for extremes  ----inclusion ----exclusion -cost effective accommodation ----design for range 5th-95th ----increasingly common is 1st to 99th
-design to fit all ----design for adjustability ----provide different sizes -design for extremes  ----inclusion ----exclusion -cost effective accommodation ----design for range 5th-95th ----increasingly common is 1st to 99th
perception, memory, decision, design standards (like safety diagram standards)