A method for diagnosing and planning the treatment of adolescent drug abusers (the Adolescent Drug Abuse Diagnosis [ADAD] instrument).

There is a need for a diagnostic method and an instrument appropriate for adolescent drug abuse clients, that permits the assignment of clients to the most appropriate treatment setting, provides the basis for individualized treatment planning, and facilitates comparability across research studies. The development of the Adolescent Drug Abuse Diagnosis (ADAD), a 150-item instrument with a structured interview format, modeled after the Addiction Severity Index (ASI) (which is for adults), is described. The ADAD produces a broad-spectrum comprehensive evaluation of the client, the interviewer's ten-point severity ratings, and composite scores for each of nine life problem areas that are often relevant to the treatment needs of adolescent drug abuse clients. A series of validity and reliability tests are described. The characteristics of the standardization sample (N = 1,042), and the comparison of the characteristics of the three subsamples (outpatient, residential or non-hospital, and inpatient) are also presented.