TY  - BOOK
AU  - Gay,Geri
AU  - Hembrooke,Helene
TI  - Activity-Centered Design: An Ecological Approach to Designing Smart Tools and Usable Systems 
SN  - 0262072483
U1  - 004.019 
PY  - 2004///
CY  - Cambridge, Mass
PB  - MIT Press
ER  -