This publication, along with the rest of the publications in the series, is a product of the Juvenile Detention Alternatives Initiative (JDAI) sponsored by the Annie E. Casey Foundation. The project's objectives were to eliminate the unnecessary use of secure detention for juveniles; minimize failures to appear and the incidence of delinquent behavior; redirect public finances from building new facility capacity to responsible alternative strategies; and to improve conditions in secure detention facilities. Seven fundamental principles emerged from the experiences of JDAI jurisdictions in developing effective detention alternatives. First, detention should be viewed as a legal status, with varying levels of custody supervision, rather than as a building; second, for alternatives to detention to be effective, agreement is needed on the purpose of secure detention and of alternatives; third, detention alternatives should be planned, implemented, managed, and monitored using accurate data; fourth, a reformed detention system should include a continuum of detention alternatives, with various programs and degrees of supervision matched to the risks of detained youth; fifth, detention alternatives should be culturally competent, relevant, and accessible to the youth they serve; sixth, detention alternatives should be designed and operated on the principle of using the least restrictive alternative possible; and seventh, detention alternatives should reduce secure detention and avoid widening the net. A continuum of detention alternatives generally includes three basic program models for youth held in secure detention prior to a disposition hearing: home or community detention (nonresidential non-facility-based supervision); day or evening reporting centers (nonresidential, facility-based supervision); and shelter or foster care (nonsecure residential placement). Within each model there can be a range of degrees or levels of supervision. Other chapters in this booklet discuss detention alternatives for special populations (probation violators and youth facing adult trials), design and implementation issues, management issues, and how to get started in developing the use of alternatives to secure detention for juveniles. 2 tables, 2 figures, and a list of 4 resources