This report presents the results of the Federal Judicial Center's retrospective process-descriptive study of judge-involved supervision programs for offenders in the federal courts. It is part of a larger research effort to investigate how programs modeled on state and local drug and reentry court programs operate in the federal system. This report does not evaluate these programs, but describes the population served, the services provided, and, through official data, how the participants fared when compared with a group of similar offenders who were not in a program.