Based on her well-known book, Assessing Impact, Joellen Killion will provide guidance and practical resources for evaluating professional development impact. Her eight-step evaluation framework is grounded in three key assumptions: professional development is data-driven, research-based, and well-defined; those in charge of the professional development have the capacity to implement the learning and the evaluation; and key stakeholders intend to use the evaluation results to make decisions about the program. While intended to serve ATE evaluation efforts, the workshop is open to broad participation. Register soon at evalu-ate.org/events