Which represents a pre-post evaluation design?

Which represents a pre-post evaluation design?

• A. A comparison of scores between two programs
• B. Comparing test scores before participation with after service
• C. Using prior year benchmarks
• D. Collecting scores from a nonparticipant control group

Answer: (B)

The main idea is measuring change within the same people by taking a baseline measure before the service and a follow-up measure after the service. This design tracks how outcomes shift over time for the same individuals, which helps show whether the intervention may be associated with that change. Comparing scores before participation with after service fits this pattern precisely, because you have a pre-intervention measurement and a post-intervention measurement for the same group, allowing you to see the amount of change that occurred during the service period. Other approaches compare different groups, rely on benchmarks from prior periods, or use a nonparticipant control without the same pre-measure, which don’t capture the within-subject change that defines a pre-post design. Keep in mind that while this design reveals change over time, it’s still vulnerable to factors other than the service, like maturation or external events, that could influence outcomes.

The main idea is measuring change within the same people by taking a baseline measure before the service and a follow-up measure after the service. This design tracks how outcomes shift over time for the same individuals, which helps show whether the intervention may be associated with that change. Comparing scores before participation with after service fits this pattern precisely, because you have a pre-intervention measurement and a post-intervention measurement for the same group, allowing you to see the amount of change that occurred during the service period. Other approaches compare different groups, rely on benchmarks from prior periods, or use a nonparticipant control without the same pre-measure, which don’t capture the within-subject change that defines a pre-post design. Keep in mind that while this design reveals change over time, it’s still vulnerable to factors other than the service, like maturation or external events, that could influence outcomes.