The existing prison system is currently fully managed by the public sector, although the government plans to privatize part of the prison system. The analysis suggests that a model that examines only the extremes has limited usefulness. In fact, within a government-managed system, a wide range of service providers operate from a variety of bases. A model is proposed that emphasizes clarity of results and efficiency of processes and that is useful at a time of great change in the New Zealand prison system. This model suggests the benefits of having a mix of providers, including profit-oriented providers, private practitioners, nonprofit organizations, government agencies, and volunteers, as well as prisons providing their own servies. Issues that a mix of service providers raise include responsibility, accountability, cultural issues, and the implementation of a management structure appropriate to ensure that desired results are obtained so that services are integrated. 5 references (Author abstract modified)