In longitudinal studies, the same variables must be measured, in the same way, on at least two occasions. Research personnel are very important in keeping the necessary continuity of the procedures and the comparability of the measurements over time. As staff turnover can create serious problems, this paper suggests several strategies for reducing staff attrition in longitudinal studies. When hiring, it should be determined if the candidates are strongly motivated and view the study as related to their future goals. After hiring, staff should be provided with the opportunities which encourage them to make a personal investment in the study. When staff leave, people who understand and accept the conceptual and procedural boundaries of the study should be employed in their place. Prior to the second data collection wave, review of the study's conceptualization by new and continuing staff through the reanalysis of the initial data is recommended. To insure measurement consistency, training current staff through field testing the data collection procedures is suggested. In addition, the importance of establishing procedures for maintaining ongoing written documentation on the instrumentation, coding procedures, and quantitative data files is stressed. Bibliographical information for 10 research reports published by Alverno College are cited on the verso of the title page. (JAZ)