The Guttmacher Institute collaborated with the International Union for the Scientific Study of Population (IUSSP) to edit and publish this volume. It is based on the International Seminar on Measurement of Abortion Incidence, Abortion-Related Morbidity and Mortality, which took place in Paris, France, in November of 2007. The seminar was convened by the IUSSP Scientific Panel on Abortion. The volume includes 14 chapters primarily based on papers presented at the seminar in addition to a few chapters on notable methods and topics that were not covered at the seminar.