This document provides guidance on selecting case studies for assessing access to information. It recommends choosing 18 total case studies across four pillars: access to information, public participation, access to justice, and capacity building. For access to information, it recommends 8 case studies across several mandatory and optional types, including large and small environmental emergencies, air and water quality monitoring systems, facilities-level reporting, and state of the environment reports. It provides guidelines for selecting representative, recent case studies for each type and outlines indicators for assessing each case study.