First a slip in birth control, and later an abortion: that is how the facts present themselves if written down on a calendar. But the acceptance of such a point of view already espouses the limits of thinking in terms of cause and effect. It has also been suggested that abortions result from a lack of information on the various methods of birth control. But that conjecture has proved dubious. Clinics report that most of the women for whom they have performed an abortion were well aware, at the time of becoming pregnant, of the use of birth-control devices, even though in fact they did not make use of them, or employed them incorrectly.