Collective Impact is intended to help community leaders effectively engage participants in strategic planning initiatives and achieve desired results. It is a logical extension of, and builds on, earlier efforts that experienced difficulties helping groups implement actions identified in the planning processes. This book examines successful practices that apply Collective Impact principles to a variety of community development issues including reducing poverty, and similar topics. Contributing authors also examine techniques used in working with local groups to facilitate effective changes in their communities. The discussions focus on settings in which Collective Impact efforts are likely to succeed using a variety of case studies that vary by intent, purpose, and location. Discussions of involvement by community and campus partnerships, regional planning organizations, and other groups can affect the ways in which Collective Impact principles are applied and how well they work. The discussions conclude with transformational changes within Collective Impact, moving from the individual to the system and future directions for Collective Impact approaches. Practitioners and scholars alike will find the discussions of various approaches and outcomes using Collective Impact useful in designing future efforts to bring about community change. This book was originally published as a special issue of the journal Community Development.