For evaluators, coalition assessment is a growing field of experimentation and learning. Innovation Network has been evaluating coalitions since 2006, beginning with the Coalition for Comprehensive Immigration Reform, a national effort to secure passage by the U.S. Congress for comprehensive immigration reform. Over the years, we have evaluated many different types of coalitions throughout the United States. Our coalition partners have worked at national, state, regional, and local levels on a variety of advocacy and policy change goals, such as healthy community design or childhood nutrition. This white paper provides practitioners and funders with insights into the coalition assessment process along with concrete examples and lessons we've learned from our own work.