School systems must be able to attract high quality teachers and, if necessary, to attract them across state boundaries. Pension portability, which allows workers to change jobs and retirement systems without losing retirement benefits, is essential to accommodate an increasingly mobile work force. This paper reviews the National Governors' Association's involvement in the issue of pension portability; provides background information, including data on teacher mobility; discusses the characteristics of teacher pensions in the 50 states; and describes options to improve teacher mobility, such as the Canadian Reciprocity Agreement (CRA). Appendices provide data on the characteristics of state retirement systems, a comparison by state of retirement service credit option purchases and stipulations, a set of tables showing projected transfers based on the CRA, and sample portions of the CRA. (LMI)