Parliamentary involvement in grassroots communtiy development has grown considerably across Commonwealth countries. One important tool in this effort has been the Constituency Development Fund (CDF), which appropiates national funding for MP-influenced, locally determined, constituency-level development. This document provides with principles and guidelines for the operation of CDFs that are consistent with international norms and values about legislative performance and socio-economic development. These principles highlight the importance of transparent project selection and implementation in a manner that enables citizens to work together for the development of their consituency, demand accountability and maintain regular oversight.