Knowing what works, how well, and under what conditions is essential for engaging audiences in Earth and Space science and improve engagement. Program evaluation allows us to be able to describe why programs are effective as well as collect data to make suggestions for improvement. We invite presenters to present about evaluation of education, public outreach, and communication programs. We invite program evaluators and programs to present on their collaborations and to share their findings and lessons learned as well as innovative ways they are integrating evaluation into their projects.