John M. Daughtry III Umer Farooq Jeffrey Stylos Brad A. Myers API usability: CHI'2009 special interest group meeting. 2771-2774 2009 CHI Extended Abstracts http://doi.acm.org/10.1145/1520340.1520403 conf/chi/2009a db/conf/chi/chi2009a.html#DaughtryFSM09