This document provides an agenda for a session on impact evaluations (IEs) at a think tank conference in Istanbul. The objectives are to raise awareness of IEs among think tanks, share resources for IE work, and learn what capacity think tanks want to develop. The session will include presentations on designing and implementing policy-relevant IEs, as well as a discussion of think tanks' interests in IE capacity development to inform future strategy. Presenters will discuss IE methodology and promoting uptake of findings, with discussants providing comments. The goal is to help think tanks produce high-quality evidence to inform policymaking through rigorous impact evaluations.