The principal determinant of fertility in developing countries appears to be availability and knowledge of means for fertility control.  Family planning programs have attempted to meet these demands by supplying services and supplies.  This report analyzes family planning programs and fertility data for 42 developing countries.  Silhouettes formed by plotting age specific fertility rates for different years show large declines in fertility during the 1960s for Hong Kong, Taiwan, Singapore, South Korea, Chile, Trinidad and Tobago, and Costa Rica.  These fertility declines have been influenced by different program strategies, such as the emphasis on the IUD in Taiwan, and on the oral contraceptives in Singapore and Korea;W In the developed countries the impact of oral contraceptives and  abortion is evidenced by the stabilized low levels of fertility.  The data illustrate that national family planning programs have helped to decrease fertility in the 1960s.