This document describes a collaborative model of inservice teacher education involving the use of a school-based intermediary training cadre, and the application of this model in a particular school setting. The aim of the Trainer of Trainers Model is to spread the effect of training delivered by an external interdisciplinary university training team to a school district by building the internal capacity of the district to plan and deliver its own inservice program. Collaboration is viewed as an integral part of the program--in needs assessment, goal formation, planning, and training. The steps in developing a Trainer of Trainers program (planning, cadre training, school training, and support) are presented in outline form. Application of the Model to a specific situation (inservice training in reading instruction) at the Lynwood (California) Unified School District is described. Formative and summative evaluation indicates that (1) the program design is strongly accepted by district personnel, (2) participation in program planning and implementation by program participants is encouraged, (3) growth is evident in both trainers and participating school staff, and (4) skills of resource teachers are strengthened in the areas of training, reading instruction, use of paraprofessional and community resources, and individualized instruction techniques. (MJB)