This report synthesizes the proposals made by Parties and observer organizations on ways to enhance the engagement of observer organizations. These include a range of proposals in relation to substantive inputs, admissions and access, registration and organizational issues, the role of constituencies, guidelines for participation, and practices taken from other processes. In total, five submissions were received from Parties and 16 from observer organizations. The report also reviews the background of observer engagement in the UNFCCC process, as well as previous consideration by the Subsidiary Body for Implementation of ways to enhance the effectiveness of this engagement