This is a handbook to help planners and implementers to look at the effectiveness of their BCC interventions. Implementers can use the handbook to help them monitor, since the handbook can point out both strengths and potential weaknesses of an ongoing intervention. The handbook can also be used as a planning tool because it highlights important points for the design and development of effective BCC programming. The handbook was developed in the context of HIV programs; however the tools and concepts can be adapted for other health topics.