Public-private partnerships are integral to our public health paradigm. The Coalition Training Institute (1995-1998) trained 283 participants from 29 U.S. cities, 49 states, and 7 U.S. territories to foster and sustain partnerships that improve immunization rates. Evaluation consisted of on-site and follow-up surveys, effectiveness inventories, and focus groups. The Institute met participants' expectations. Four months later, participants reported training was applicable (93%) and helpful in overcoming organizational barriers. Most built or improved coalitions (81%), helped organizations apply new ideas (86%), and obtained training/support (60%). Participants requested more on-site and distance-learning opportunities to network, train coalition leaders and members, and learn new skills.