Karl Weick gives a useful operational definition of commitment. I am probably paraphrasing but my memory of it is: 1) personal, 2) voluntary, 3) public, and 4) irrevocable statement of intentions and agreements. In a coalition, don't assume you have commitment without having all parts of this formula for each key stakeholder and leader. Get boards, CEOs, opinion leaders, and frontline staff to tell their stories in a way that fulfill these criteria. Model it yourself and invite others.