Social and behavior change is necessary to improve all components of feeding young children: adequate food, adequate services, and adequate feeding practices. This workbook highlights challenges and examples specific to quality social and behavior change for improving complementary feeding. The basic concepts of quality social and behavior change design; implementation; and monitoring, evaluation, and learning presented in this workbook can be used for improving other nutrition behaviors. For any behavior, be sure to tailor the steps to the local context and engage appropriate stakeholders along the way.