Community readiness is a research-based theory that provides a basic understanding of the intervention process in communities. This theory allows us to accurately describe the developmental level of a community relative to a specific issue or problem. In order to move the community toward implementing and maintaining efforts that are effective and sustainable, community mobilization must be based on involvement of multiple systems and utilization of within-community resources and strengths. Successful local prevention and intervention efforts must be conceived from models that are community-specific, culturally relevant, and consistent with the level of readiness of the community to implement an intervention. The community readiness model is an innovative method for assessing the level of readiness of a community to develop and implement prevention programming. It can be used as both a research tool to assess distribution of levels of readiness across a group of communities or as a tool to guide prevention efforts at the individual level. This tool has proven useful in addressing a gamut of problems ranging from health and nutritional issues to environmental and social issues. The model identifies specific characteristics related to different levels of problem awareness and readiness for change.