This report examines teacher pension plans in Missouri, with a particular focus on the Kansas City and Saint Louis school districts. Missouri is unusual in that public educators are divided among three pension systems: the Kansas City Public School Retirement System (KC), which covers 3 percent of Missouri teachers; the Public School Retirement System of the City of St. Louis (STL), which covers 4 percent; and the state Public Service Retirement System (PSRS), which covers the remaining 93 percent of teachers. Kansas City and Saint Louis teachers are enrolled in Social Security, while teachers in the larger state system are not. There is no reciprocity between the systems, which means that teachers lose employer contributions if they change systems. Costs have risen sharply over the last decade in the STL and PSRS plans. They will begin rising in the KC plan in 2014. Due to additional notable features of the pension landscape for public educators in Missouri, the authors find that the maintenance of separate pension plans for Kansas City and Saint Louis teachers represents a costly barrier to school improvement that needlessly balkanizes the market for educators in the two metropolitan areas. Therefore they recommend a reform agenda for the pension plans that includes six specific elements. [For the erratum to this report, see ED603522.]