Developmental evaluation (DE) is an approach that is useful when the connection between solutions and problems is not clear or when situations are complex and continuously evolving. In DE, the evaluator acts as a co-creator with the project partners to support learning and adaptation. The evaluator helps partners assess what factors they should consider and structures feedback to facilitate collective learning and effective collaboration. Typical results of DE include identifying principles and relationships to focus on, discussing how they could apply in different contexts, and establishing mechanisms for real-time feedback to promote social learning and transformation.