In 2010 in France, contraceptive prevalence rate in women is high and the pill is the most commonly used method: 90% of 15-49 years old sexually active women who do not want to become pregnant use a contraceptive method, and 56% of them use the pill. In younger women, this rate is even higher: 92% of 18-24 year-old females practice contraception, with 84% of them using the pill. However, 48 % of pregnancies in this age group remain unplanned, and is related to a pill misuse in more than 50% of the cases. The high rate of pill use may be partly explained by a unchallenged contraceptive usage pattern, with an entrance in sexual life with condoms first, then with contraceptive pills and finally with an IUD when the wished number of children is reached. This pattern is set up firstly by professionals who infrequently suggest other contraceptive methods and at secondly by young women who think that the pill is a compulsory step. Professional recommendations have been disseminated since 2004 to adapt contraception to women life styles and constraints and to break this general pattern, but their implementation still needs to be improved. Our goal is to reduce unplanned pregnancies due to pill misuse in women aged 18-24 years old. Before defining a strategy we needed to learn about the strategies that had already been implemented and evaluated.[extrait poster]