Why Pharmacokinetics? An Introduction and Overview.- Why Pharmacokinetics? An Introduction and Overview.- Experience with Contraceptive Side Effects.- Selection of a Contraceptive: What Guides a Woman?.- Contraceptives and Women’s Complaints: Preliminary Results from the Post-Marketing Surveillance of Norplant®.- Regional and Individual Variation in Bleeding Patterns Associated With Steroid Contraception.- Variability in Menstrual Bleeding Patterns: Comparing Treated and Untreated Menstrual Cycles.- Contraceptive Use and Discontinuation: The Social Meaning of Side-Effects.- Variability in Steroid Pharmacokinetics.- Population and Delivery Systems: Variability in the Pharmacokinetics of Long-Acting Injectable Contraceptives.- Pharmacology of Ethynl Estrogens in Various Countries.- Pharmacokinetics of Norplant® Implants.- Pharmacokinetic Drug Interactions with Oral Contraceptives.- A Critical Evaluation of the Pharmacokinetics of Contraceptive Steroids.- A Short Review on the Sources of Variability in Pharmacokinetic Parameters of Sex Steroids: Comment on the Paper by K. Fotherby.- Lessons from Endogenous Metabolism.- Diet and Estrogen Metabolism.- Diet, Circulating Estrogen Levels and Estrogen Excretion.- Variations in Estrogen Metabolism: Commentary on B. Goldin.- Body Fat, Fat Topography and Endogenous Steroid Metabolism.- Implications for Policy and Programs.- Steroid Contraceptives and Women’s Response: Program Considerations from the Quality of Care Perspective.- Bringing a Client and Life-Cycle Perspective to Scientific Evidence.- Commentary on Presentation of Dr. Pramilla Senanayake.- A Clinician’s Perspective.- Future Research Directions.- Regional Population Differences and Population Pharmacokinetics of Steroidal Contraceptives.- Variability in SteroidPharmacokinetics: Needs for Future Research.- Experimental Design for Future Research.- Looking Forward: New Research Priorities.- Contributors.