In recent years, the Carnegie UK Trust has been involved in coordinating, supporting, and participating in a range of different kinds of networks. There are many reasons that people choose to develop networks as an approach to achieving a goal. We were interested in building our understanding of the evidence on the effectiveness of networks as a vehicle for policy and practice change. In Autumn 2020, we began working with Ilona Haslewood to explore how to define a network, when it is appropriate to use this approach to achieve a particular goal, and what is the role of charitable foundations in supporting the development of networks. These questions, and more, are examined in A review of the evidence on developing and supporting policy and practice networks, which was written by Ilona Haslewood. This review of evidence forms part of a broader exploration of the role of networks, which includes a case study summary of A Better Way.