This volume is the second in a series of papers about systems approaches in complex environments, which includes the use of the collective impact model to address large-scale social problems, and the application of participant-driven MEL techniques across 17 networks of civil society organizations. It is based on the experiences of Root Change and Chemonics, two development partners working on a USAID civic engagement project in Nigeria (2013-2018), as well as hundreds of Nigerian civil society organization partners. This is the second volume and aims to address the innovative use of the advocacy strategy matrix, adapted from work by the Center for Evaluation Innovation, for collective impact and the Collective Impact Model, an approach that engages multiple players in working together to solve complex social problems.