Restrictions, Constraints
Restrictions:
small memory, slower processors, small bandwidth
these are cited often, but less and less relevant
modern mobiles are like PC-s 10 years ago
they are getting stronger every day
Constraints:
small overall size, small screen
small, only numerical, or no keyboard at all
different usage environments (on the street, on a train…)
hands-free, one handed, or two handed usage
most users are non-technical
systems should work
immediately
when switching on…
(just like a light switch)
Technical restrictions may become less relevant, but…
…the constraints are bound to stay!
I Herman
, W3C, Head of Offices,
© 1994-2004, W3C (MIT,ERCIM,Keio)
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