In Fall 2009, University of the Pacific's (Stockton, CA) Health Sciences Branch (HSB) Library initiated a reference training program to develop staff competencies and skills in order to promote a uniform level of reference expertise. Training was delivered in a wiki format, informed by constructivist principles. Constructivism views learning as a dynamic process-- learners actively construct knowledge, which is built upon earlier experiences. Content on the wiki was participant-driven and guided by individual interests. The session included a summary of Pacific’s program and its assessment, an overview of constructivist learning, applications for wiki technology in the library setting, and a facilitated discussion with audience feedback collected by clickers regarding these ideas’ applicability within libraries.