International networks for social change are growing in number and influence. While they need to be able to assess the extent to which they achieve their purpose and determine ways in which to be more effective, conventional evaluation methods are not designed for such complex organisational forms, or for the diverse kinds of activity to which they are characteristically dedicated. Building on an earlier version of the paper, the authors present a set of principles and participatory approaches that are more appropriate to the task of evaluating such networks.