By the end of the 1970s, at least two "portable" computers were on the market; the lightest was the size of a sewing machine and weighed 24 lb (11 kg). Then industrial designer Bill Moggridge devised the Grid Compass, which could fit in a briefcase because its clamshell design allowed the screen to fold down on the keyboard. Moggridge, who died Sept. 8 at 69, pioneered the theory of interaction design--how people relate to the digital world. His work reflected insights from psychologists, sociologists and anthropologists, and he encouraged his designers to work in large, diverse teams--a philosophy he last applied...
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