A computer managed instruction (CMI) instructor role definition and training package was designed to help CMI teachers acquire the skills necessary to perform seven theoretically-based instructor roles: planner, implementer/monitor, evaluator/provider, diagnostician, remediator, counselor/advisor, and tutor/modeler. Data for the evaluation of the training package were collected from experimental (N=10) and control groups (N=10) consisting of CMI instructors at Naval and Air Force technical training centers. Navy and Air Force instructors in the experimental groups first participated in a 20-hour training program which comprised the 12-module CMI instructor role training package and six group discussions. Air Force instructors in the experimental group also received a 10-hour student motivational skill training package. Following the training sessions, instructors in the experimental groups returned to their CMI learning centers and data were collected on a number of measures during a 3- to 5-month evaluation period. Both quantitative and qualitative findings indicated that the training package met the goal of providing relevant and needed training in Navy and Air Force settings. Instructor training in theoretically-based CMI roles also contributed to more positive student attitudes toward CMI and their CMI instructors, and to generally lower student elimination rates. It is recommended that Navy CMI schools continue to use the training materials as part of their inservice instructor training. A list of references is provided as well as four appendices, which include a description of the CMI instructor role training package, copies of the CMI instructor survey and student attitude questionnaires, and additional group discussion topics for the training package. (JB)