William Ryan Erik Stolterman Heekyoung Jung Martin Siegel Tonya Thompson William R. Hazlewood Device ecology mapper: a tool for studying users' ecosystems of interactive artifacts. 4327-4332 2009 CHI Extended Abstracts http://doi.acm.org/10.1145/1520340.1520661 conf/chi/2009a db/conf/chi/chi2009a.html#RyanSJSTH09