Description: In the determination of pension costs the actuary normally has available for use several turnover scales which indicate rates of turnover by attained age. This paper attempts to outline broadly one method for classifying selected industries into three groups approximating low, medium, and high turnover levels, so that a more appropriate initial selection of turnover scales may be facilitated. From Transactions of Society of Actuaries 1968, Vol. 20, Pt. 1, No. 58.