The protocol was designed to test the effectiveness of an Organizational Process Improvement Intervention in improving four assessment and case-planning domains for drug-involved offenders in correctional settings by transferring them to community treatment-based agencies. This article describes the protocol and the change team model process through which correctional and community agency staff collaborated to improve assessment and case planning for offenders with substance abuse problems. The primary goal of these collaborative efforts was to link information across stages of the treatment continuum to improve service coordination. Data taken from qualitative interviews with agency participants are used to illustrate the common themes that emerged relating to the intervention process, barriers to implementing developed goals, and facilitative factors that contributed to successes. The study findings indicate that organizational process improvement strategies can be implemented within a correctional setting to reduce inter-organizational barriers and to facilitate improvements in the continuum of care in the treatment of offenders with histories of substance abuse. (Publisher abstract modified)