Which statement describes the role of combining different measures in program evaluation?

• A. Process, outcome, and impact measures are all the same concept.
• B. Only process measures matter for evaluation.
• C. Only outcome measures matter for population-level conclusions.
• D. A mix of process, outcome, and impact measures, plus timeliness and efficiency.

Answer: (D)

Using a mix of information lets you see not just if a program works, but how it was delivered, what immediate changes occurred, and the overall effects on the target population, all while considering how quickly and efficiently results are produced. Process measures track how the program was implemented—the fidelity to the plan, reach to the intended audience, and whether activities happened as scheduled. Outcome measures look for short-term changes that the program aims to influence, such as shifts in knowledge, attitudes, or behaviors that signal the program is starting to work. Impact measures assess longer-term, population-level effects, like changes in health outcomes or incidence of disease, which show the real magnitude of the program’s influence. Timeliness ensures data are available when decisions need to be made, and efficiency asks whether the results justify the resources spent. Together, this combination gives a complete, actionable picture; relying on a single type can miss either how the program was delivered, whether it produced early gains, or whether it achieved lasting, meaningful change.