This is the final article in a series on a survey of 710 couples who consulted for family planning in Lyons and Paris in 1968, Agreement before marriage on planned family size was correlated with success in achieving this plan, especially in the young, well educated, and in rightists. The number of children was directly related to desired family size, but a large proportion of those without a plan had uuplanned children. Factors tending toward larger desired family size were religious practice, higher education, and income. Factors associated with larger existing families were lower education and income, religous practice, female unemployment, longer duration of marriage, and use of traditional contrceptive methods. Among those with only elementary education, the proportion with 3 or more children remained constant with rising income, but among those with postsecondary education the proportion of large families was closely correlated with income. Couples who considered their families complete or who considered their family planning successful were overrepresented by the well educated, while couples with incomplete families or characterized by imperfect planning were more often secondary school graduates. Success in family planning was only apparent in many cases, since these results were often achieved by abortion.