Addiction and the Vulnerable Self: Modified Dynamic Group Therapy for Substance Abusers - Hardcoverby Edward J. Khantzian (Author), Kurt S. Halliday (Author), William E. McAuliffe (Author) The Harvard Cocaine Recovery Project, a National Institute on Drug Abuse funded randomized clinical trial, was initiated in 1986 to compare different approaches for treating cocaine abusers. Modified Dynamic Group Therapy (MDGT), one of the models used in the study, is a short term supportive expressive psychodynamic group approach specifically adapted for