This document summarizes a breakout session at an OECD conference on measuring regulatory performance. The session discussed developing more systematic approaches to joint ex-post evaluation across policy instruments. While ex-ante evaluation is undertaken more systematically than ex-post, ex-post approaches vary and oversight is often weak. The session aimed to promote synergies between regulatory and expenditure evaluation, such as common frameworks and transparency norms. Questions focused on practical examples of joint evaluations, their value, and enabling better collaboration between institutions.