Program evaluations involve collecting data about programs and analyzing that data using qualitative or quantitative statistical methods to answer research questions about the program. The example given in this week's Introduction (evaluating program effectiveness for stakeholders or policymakers) is only one among many reasons for performing an evaluation.
Researchers also conduct evaluations to revise programs and contribute knowledge to new theories. Evaluations that improve programs may clarify the dose or intensity of the intervention that is required to produce change, specify the methods that produce the most powerful change, identify better strategies for increasing participation or adherence in programs, identify subgroups for whom the intervention is particularly effective (or ineffective), or change program content to improve the outcomes.
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