Builds on the findings of the first and second papers. It examines specifically how campaigns with different purposes (individual behavior change and policy change) have been evaluated, and how evaluators have tackled some of the associated evaluation challenges that the first three papers raised as important to address. It features fi ve brief case studies in which the main unit of analysis is not the campaign, but the campaign's evaluation. The case studies provide a brief snapshot of the real experiences of campaign evaluations. The paper also features cross-case lessons that highlight important findings and themes.