Hey, I understand the logic model is very important for program evaluation. Would you please kindly explain more to me?

Glad to hear.

Oh, I understand it now. Many thanks!

A logic model actually serves several purposes. It can help implementers recognize gaps in the logic of transformation early so they can take appropriate steps to modify the intervention to ensure success. As an evaluator, you can use the logic model approach to determine at the outset whether the intervention has a strong underlying logic and a reasonable chance of improving outcomes, and what effect sizes the intervention might need to produce to be likely to yield statistically significant results. In addition, the logic model will help you decide what to measure at different points in time to show whether the intervention was implemented as intended, improved outcomes, and created unintended outcomes, and identify any facilitators and barriers to implementation. However, while the logic model is important, you should remain open to unexpected information, too. Finally, the logic model’s depiction of how the intervention is intended to work can be useful in helping you interpret findings. For example, if the intervention targets more assistance to practices that are struggling, the findings may show a correlation between more assistance and worse outcomes. Understanding the specifics of the intervention approach will prevent you from mistakenly interpreting such a finding as indicating that technical assistance worsens outcomes.