Abstract: The analysis of contraceptive calendar data offers a valuable and useful approach to enhancing our understanding of patterns of contraceptive use in the developing world. Effective use of modern contraception is believed to be the surest way to plan for births and avert unwanted fertility. Despite the role that contraception plays in reducing fertility, sexually active women (especially those in sub- Saharan Africa), continue to grapple with unwanted and mistimed pregnancies. In many instances, this results in unsafe induced abortion, with its attendant risks to maternal health. Sub-optimal use of contraception is likely to attenuate fertility transition in the region. Using calendar data from two Demographic and Health Surveys conducted in Uganda, we adopt a longitudinal approach to examine method discontinuation and switching patterns following stopping use of a contraceptive method. Discontinuation of methods was more pronounced among women using the pill and injection. The findings provide a basis for a discussion on the implications of reproductive behaviour in sub-Saharan Africa. Key words: Calendar data, discontinuation, switching, Uganda Peter Kisaakye is a doctoral student at the Centre for Actuarial Research, University of Cape Town. Tom A Moultrie is professor of demography and director of the Centre for Actuarial Research, University of Cape Town.