While the philanthropic sector continues to grow, demands for efficient, innovative, and effective use of philanthropic funding are increasing. The International Network on Strategic Philanthropy (INSP) uses its international expertise to determine just which issues are key to effective philanthropy. Over the last four years, more than 60 philanthropy experts from 15 countries have exchanged ideas on issues such as evaluating philanthropic work, the implications of globalization for the development of the philanthropic sector, and the emergence of new forms of philanthropy. Their discussions cover a wide range of developments from around the world: Australia, Belgium, Brazil, Canada, France, Germany, Israel, Italy, Mexico, Poland, Portugal, Switzerland, Thailand, the United Kingdom, and the United States. Rethinking Foundation Effectiveness provides a summary illustrating the results of these discussions and enables foundation managers and project teams to learn about, and adapt their own activities to, international best practice.