This manual, which is designed to assist potential users of the Leader Attributes Inventory (LAI) and individuals studying leadership and its measurement, presents the rationale and psychometric characteristics of the LAI and guidelines for using it. Described in chapter 1 are the context in which the LAI was developed and the conceptualization of leadership that forms its foundation. Chapter 2 explains how the LAI is used. Presented in chapter 3 are the developmental history of the LAI and the measures of its reliability and validity. The process used to establish norm groups and standards for the LAI are outlined in chapter 4. Fourteen tables/figures and 69 references are included. Appended are the following: an LAI rating-by-observer form; information on the development of the Leadership Effectiveness Index (LEI), which provides a criterion used to estimate the LAI's validity; a copy of the LEI; a sample individualized feedback report; 38 tables converting LAI raw scores to normalized t-scores with standard errors of measurement (SEM); a table converting normalized LEI scores to normalized t-scores with SEM; and formulas for predicting leadership performance from the average score of all LAI attributes. (MN)