Data from PFS are used for a variety of purposes by Congress, state education departments, federal agencies, private school associations, and educational organizations. PFS can be used to research issues related to principal attrition and mobility. Stayers, movers, and leavers can be profiled and compared in terms of principal experience, working conditions, job satisfaction, and incentives and disincentives for remaining in or leaving the profession. PFS also provides a measure of national principal attrition and updates information on the education, training, and career paths of principals. In addition, sampled principals can be linked to SASS or NTPS data to determine relationships between local district and school policies and practices, school characteristics, and teacher attrition and mobility.