Our formative work with abortion advocates revealed a need for more evidence about the safety of abortion, incidence of second trimester abortion, and the impact of the change in abortion law in Mexico City in 2007. Building on our current productive collaborations and responding to identified research needs, the goal of this proposal is to leverage existing data to answer priority questions about abortion in Mexico. In a second phase, we will develop and execute a dissemination strategy in collaboration with local partners to ensure that our findings areaccessible.In Aim 1, we will a) describe second trimester abortion in public hospitals in Mexico City; b) test for changes in abortion mortality (number of abortion-related deaths/100,000 abortion-related hospitalizations) over time; c) Describe abortion and suspected abortion as a cause of maternal death nationally over time; and d) compare contraceptive use among public abortion patients and a matched population-based sample. In Aim 2, we will translate research findings into advocacy and communication products, and disseminate with local partners.Our team has experience in Mexico and deep knowledge of the datasets we will use; we understand which questions the data will support. We have strong quantitative skills and keylocal partners in the National Institute of Public Health and Ipas Mexico. This study will provide our partners with rigorous, accessible evidence about abortion in Mexico, which is urgentlyneeded to support advocacy, training, and service provision, and ultimately, to expand access to abortion and improve health outcomes for women.