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An articulated model of how a program or project is understood or intended to contribute to its specified outcomes and that focuses on intermediate outcomes rather than tightly specified processes is a logic model. Such models are usually shown diagrammatically but can be reported in narrative form. Although logic models have become increasingly popular in recent years, their use can be traced back at least to the 1960s, when Suchman suggested that evaluation might address the achievement of a “chain of objectives.”

Logic models can be developed prospectively for planned new programs or retrospectively for existing programs. Logic models can be used in various ways: (a) to guide an evaluation; (b) to provide staff and other stakeholders with a common, motivating vision; and (c) to report ...

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