What is a logic model?

• A. A diagram linking program inputs, activities, outputs, outcomes, and impacts to show how a program works.
• B. A statistical model used to infer causality in observational studies.
• C. A budgetary tool for program cost estimation.
• D. A chart of randomization sequences in a study.

Answer: (A)

A logic model is a diagram that maps how a program is supposed to work by linking inputs (resources like funding and staff) to activities (what the program does), to outputs (the tangible products or services delivered), to outcomes (the short- and intermediate changes for participants), and finally to impacts (long-term effects on the community). It represents the plan or theory of change behind the program, making assumptions explicit and identifying what will be measured to show progress. This clarity helps with planning, guiding implementation, and evaluating whether the program achieves its intended results.

This fits best because it specifically illustrates the directed sequence from resources through activities to observed changes, which is the purpose of a logic model. In contrast, a statistical model concerns analyzing data to infer causality, a budget tool focuses on costs, and a chart of randomization sequences relates to study design—all different concepts not describing the program’s planned causal pathway.