Subjects who meet DSM-IV cocaine dependence or abuse and other inclusion criteria will be randomly assigned to an IM or NT group, using an adaptive urn randomization procedure, which adjusts for gender, referral source (self-referred or count-mandated), psychiatric medication (yes/no), and type of cocaine addiction (polydrug vs. cocaine only). Simple randomization may not be adequate to assure a balance between the groups of known predictive indicators. While the primary basis of assignment remains randomization, urn randomization biases assignment towards balance between groups based on variables known to be related to treatment outcome when sample sizes are intermediate. Randomization reduces the possibility that one group will be assigned a disproportionate number of the few patients in certain subgroup.