This document is a teachers' resource manual, grades Kindergarten through Twelve, for the promotion of students' facility in written composition in the context of a language-experience approach and through the use of diagnostic-prescriptive techniques derived from modern linguistic theory. The "Individualized Language Arts: Diagnosis, Prescription, and Evaluation" project (on which this manual is based) was validated in 1973 by the standards and guidelines of the U.S. Office of Education as innovative, successful, cost-effective, and exportable. As a result of the validation, the project is now funded as a demonstration site by the New Jersey ESEA Title III program. This Project, it is stated, was designed to meet the critical need of educators to develop more effective methods of analyzing students' writing, and to prescribe and apply individualized instructional techniques in order to promote greater writing facility. The students' writing development is traced by three samples, taken at three intervals during the year. The evaluation of the samples, based on commonly accepted Language Arts objectives is considered to pinpoint each student's current strengths and needs. A prescriptive program which is said to emphasize the integration of subject areas is used in this Project. The program utilizes an individualized approach, and is used in grades one through twelve. (Author/JM)