This document contains the executive summary of “Family Planning Programs for the 21st Century: Rationale and Design.” The first half of the book makes the case for why increased funding and support for voluntary family planning programs are needed. The second half explains how reinvigorated voluntary family planning programs can be structured to operate more effectively. Family planning is one of the most successful development interventions of the past 50 years. It is unique in its range of potential benefits, encompassing economic development, maternal and child health, educational advances, and women’s empowerment. Research shows that with high-quality voluntary family planning programs, governments can reduce fertility and produce large-scale improvements in health, wealth, human rights, and education. Substantial investments in promoting voluntary family planning programs and increasing access for all women should be a top priority