PART I KEY CONCEPTS Definition Impact evaluation is an assessment of how the intervention being evaluated affects outcomes, whether these effects are intended or unintended. The proper analysis of impact requires a counterfactual of what those outcomes would have been in the absence of the intervention. 1 There is an important distinction between monitoring outcomes, which is a description of the factual, and utilizing the counterfactual to attribute observed outcomes to the intervention. The IFAD impact evaluation guidelines accordingly define impact as the " the attainment of development goals of the project or program, or rather the contributions to their attainment. " The ADB guidelines state the same point as follows: " project impact evaluation establishes whether the intervention had a welfare effect on individuals, households, and communities, and whether this effect can be attributed to the concerned intervention " .
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