The Individual Assessment Profile (IAP), a structured intake assessmen
t interview instrument in the public domain, was designed for use with
substance-abusing populations in several large-scale and community-ba
sed drug abuse treatment projects underway in the United States. Backg
round information is presented, including the content-based item-selec
tion process used during the pretests and pilot testing. Validity and
test-retest reliability data are also presented, along with descriptio
ns of studies using the IAP for clinical, research, and management inf
ormation purposes. Concordance between biological measures and self-re
ports of recent drug use, measures of internal consistency, and test-r
etest reliability coefficients were generally good. A computer-assiste
d personal interview version of the IAP and an automated reporting sys
tem were subsequently developed for clinical and management reporting
purposes and used in a large-scale research demonstration project. An
intreatment version of the IAP has also been developed to collect info
rmation on treatment services provided and to assess changes in behavi
ors after 3, 6, and 12 months of treatment. These instruments (the IAP
intake and intreatment interviews) provide a comprehensive system to
assess substance-abusing populations.