TY  - BOOK
AU  - Gay, Geri
AU  - Hembrooke, Helene
TI  - Activity-centered design : an ecological approach to designing smart tools and usable systems
SN  - 9780262072489
U1  - 004.019 GAY 
PY  - 2004///
CY  - Cambridge, MA
PB  - MIT Press
KW  - Human-computer interaction
ER  -