The Demographic and Health Survey of Senegal carried out in 1986 with the collaboration of Westinghouse and the funding of USAID. Focused on marriage, fertility, family planning, and infant mortality. The data in this survey was compared to that of a survey conducted on fertility in 1978. All women marry before age 35 and 50% have their 1st marriage before the age of 17. A high 89% of women stay married, but 46% are in polygamous marriage (urban and literate women have lower incidence). Most births are legitimate. 5% of 1st births occur before age 15, 31% between 15-17, and urban women have their 1st child between 19-21 years of age. The average number of live births/woman is 3.3, and the synthetic index of fertility calculated for births to women aged 15-44 is 6.4 children, which has dropped from 7.0 in 1978. Contraception is known to 90% of women as opposed to 60% in 1978, and 69% are familiar with a modern method (again urban and educated women aged 20-40 score better). 12% use contraception regularly vs. 4% in 1978, and 75% of nonusers do not intend to use it. The ideal number of children has dropped from 8,8 in 1978 to 7,2. Infant mortality has steadily declined from 120 per thousand in 1971-75 to 96 in 1976-80 to 86 in 1981-85.