"At the 2011 High Level Forum on Aid Effectiveness held in Busan, Republic of Korea, all stakeholders reaffirmed the principle that civil society organizations (CSOs) are independent actors in their own right. Consistent with this principle, CSOs brought to Busan their commitment to the “Istanbul Principles for CSO Development Effectiveness,” as a set of standards that should govern CSO development work around the globe. In the two years since Busan, CSOs around the world have taken seriously their commitment to strengthen their development effectiveness. The 19 case stories published in this booklet is a snapshot of these efforts. In a synthesis of the case stories, the CSO Partnership for Effective Development (CPDE)’s Working Group on CSO Development Effectiveness highlights some of the successes and strategies to date, as well as some challenges and gaps, for CSOs in realizing more effective development impact on the lives of people living in poverty or otherwise marginalized."