Much has been written in recent years about advances in assessment technologies designed to aid decision making in the juvenile justice system. Adoption and implementation of this latest generation of actuarial tools, however, have lagged behind their development. Assessment in juvenile justice exemplifies the "science-practice gap" that has spurred a growing national interest in technology transfer. This article describes and assesses efforts in one jurisdiction to close the assessment technology gap through a progressive series of research-based strategies introducing field supervisors and staff to best practices concepts and tools while gauging their capacity for assimilating change, participative decision making and peer training, and integration of the technology with existing, related practices. Researchers' use of various data-driven monitoring reports for enhancing staff accountability and implementation fidelity, addressing resistance to the use of dynamic need factors in assessment protocols, and ongoing program and policy development and are also presented and discussed. (Contains 4 tables and 1 note.)