摘要：This article describes the use of Bennett's hierarchy in Extension program evaluation over the last 35 years. The authors discuss how the hierarchy can be linked to assess program outcomes and related costs for each level of the hierarchy and conclude that as one moves up the hierarchy, the evidence of program impact is stronger. The authors suggest a four-step framework for identifying costs for each type of outcomes—short, intermediate, and long term.
关键词：Bennett's hierarchy ; program outcomes ; costs ; evidence
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