This document discusses evaluating continuing professional development (CPD) programs using Guskey's five levels of evaluation. It begins by establishing the importance of evaluation in determining a CPD offer's impact. Level 1 evaluates participants' reactions; Level 2, learning; Level 3, organizational support for change; Level 4, application of new knowledge and skills; and Level 5, students' learning outcomes. Various tools are provided for each level. The document encourages considering all levels and discusses challenges, like timing. It concludes by having participants reflect on their organization's evaluation practices and how to strengthen them.