The goal of the CIHR Team for Improving Perinatal Health Care Regionalization in Canada is to evaluate the effectiveness and safety of perinatal care regionalization in Canada. These 2 documents describe (in summary and in detail) the various obstetric and neonatal tiers of service frameworks that exist in the provinces and territories of Canada. Details of these tiers of service were provided by the reproductive care programs of the provinces and territories and compiled by the Team on Improved Perinatal Health Care Regionalization.