Logic models can serve multiple purposes and are an important tool in both program planning and evaluation. In program planning, logic models can support census building by bringing stakeholders together around the fundamental assumption of the program. They support a shared understanding of program goals and approaches, relating activities to projected outcomes, and resources to activi- ties. Logic models can help management maintain accountability. As an evaluation tool, logic models support program monitoring, ensuring the program stays on track, does what it says it will do, and achieves the intended goals. Logic models guide evaluation questions and measures, or indicators used to identify program success. Logic models are not designed to be static and should be responsive to program modification.