The purpose of this trainer's manual is to teach drug abuse counselors: (1) the kinds of background information needed to assess a client; (2) how to interview clients to obtain the necessary information; (3) how to write up a case history; and (4) how to design individualized treatments. This trainer's manual is organized into three major chapters and appendices. The first chapter contains an introduction to the course and describes its purpose. It presents the course goals and objectives, alternate course schedulings, a brief course overview, and a summary evaluation report of the field trials. The second chapter includes training tips that may be valuable to both experienced and inexperienced trainers--tips found in this chapter are fairly general, and may be applied to other training activities as well as to the specific training of the AITP. The third chapter contains trainer guidelines--a session-by-session account of the mechanics, logistics and techniques to be used in this course. The appendices contain suggestions on alternative methods of evaluating course effectiveness as well as guidelines on how to administer the pretests and posttests of the course. Handouts for the trainees, which the trainer may photocopy for distribution during certain training activities, are included. This section also includes a bibliography and a reference list. (Author)