Different instruments are used in clinical practice to assess comorbid
psychopathology in addicted individuals. This study is aimed at compa
ring two of those instruments. In total, 327 heroin-and methadone-addi
cted individuals were interviewed in three treatment settings and outs
ide treatment. Instruments used are the Addiction Severity Index (ASI)
and the Composite International Diagnostic Interview (CIDI). The form
er instrument results in a general measure of severity of psychopathol
ogy, while the latter results in categorical DSM-III-F: diagnoses. A c
omparison of the results show, however, that the two types of data do
not agree to a large extent. By using the DSM-III-R data as golden sta
ndard, it appeared that a part of the psychopathology cases was missed
out by the ASI severity measures. The results, that are especially of
interest for clinicians using the ASI, are presented for various diso
rders. (C) 1997 Elsevier Science Inc.