This paper presents a model for professional development that is site-based and utilizes a Teacher-Mentor approach for technology training. To guide the development of such models for schools, the paper discusses the following principles: (1) the Teachers Computer Ability Profile (TCAP), a straightforward instrument teachers can use to self-assess their skills in seven areas of technology use; (2) the Individualized Professional Development Plan;(3) benefits of the Teacher-Mentor Model; (4) seven essential elements of a comprehensive teacher-mentor professional development model; (5) student involvement in the school's model; (6) development of a training curriculum; and (7) evaluation methods. Included at the end of the paper are: a diagram of the Professional Development Model, Teachers Computer Ability Profile, and online resources for technology planners. (AEF)