Till Schümmer Stephan Lukosch Robert Slagter Using Patterns to Empower End-users - the Oregon Software Development Process for Groupware. 259-288 2006 15 Int. J. Cooperative Inf. Syst. 2 http://dx.doi.org/10.1142/S0218843006001360 db/journals/ijcis/ijcis15.html#SchummerLS06