The purpose of this study was to develop inventory items that measure the study habits and behaviors of adult students from a variety of college settings. There were two specific objectives: (1) to acquire as large and heterogeneous a sample as possible in order to factor out significant study behavior constructs for building a diagnostic and predictive instrument; and (2) to contribute to research on metacognitive processes of adult students. The 46-item Study Behavior Inventory, Form D (SBI-D) is a third revision developed from Wrenn's Study Habits Inventory (1941). It was intended to measure three major factors: (1) general study habits and behaviors; (2) reading and note-taking techniques; and (3) coping with examinations. Data were collected from 1,052 students from seven schools. Descriptive and factor analyses were done with the statistical Package for the Social Sciences. A test-retest-reliability study conducted with 62 Northern Illinois University students indicated a high degree of short range consistency. Factor analysis identified significant items. Internal consistency techniques established the reliability of the total inventory and item subscales. Best and poorest items were identified to provide an objective basis for future revision decisions. (BS)