This paper discusses some of the lessons learned in the collaboration of the TriUniversity Group (TUG) of libraries; three universities in Ontario--the University of Guelph, Wilfrid Laurier University, and the University of Waterloo--participate in TUG. Four critical areas of influence in creating a human climate for effective inter-institutional collaboration are addressed: (1) building relationships, including combined staff workshops, as well as selection and implementation of an integrated online system; (2) learning, including modeling of learning behavior by senior management, investment in training and development, and involvement of consultants; (3) leadership, including team building, effective management principles and philosophical assumptions, dealing with discord among the three university librarians, and the creation of the TUG Program Coordinator position; and (4) community development, including establishing new methods, approaches, actions, interactions, and other aspects of organizational behavior. (MES)