Presented in the sourcebook for the teacher educator is the Four-D model (define, design, develop, and disseminate) to be used for developing instructional materials for training teachers of exceptional children. Listed at the beginning of chapters are instructional objectives; included when appropriate are guidelines, checklists, and flow charts. Given for use of the book are instructions such as reading chapter 1 for an overview, choosing a topic, and checking chapter objectives for essentialness to task accomplishment. Noted in the introduction are the transition in special education that requires teachers to demonstrate competency, the efficacy and validity of special training programs, and the role of the Four-D model. The stage categorized as "define" is described to be analytical and to involve five steps: front-end analysis (problems facing the teacher trainer), learner analysis, task analysis, concept analysis, and the specifying of instructional objectives. The next stage is seen to involve the design of prototype instructional material and to comprise four steps: construction of criterion referenced tests, media selection, format selection, and initial design for presentation of instruction through media such as tests, textbooks, audiotutorial models, and computer assisted instruction. The developmental stage is said to comprise modification of the prototype material through expert appraisal and developmental testing. Described for the final stage (disseminate) are summative evaluation, final packaging activities such as securing copyright releases, and diffusion. (MC)