The booklet describes professional skills thought to be essential for teachers of language handicapped children in the areas of diagnosis, instruction, and evaluation. These skills were developed by Project CHILD, a research effort to validate identification, intervention, and teacher education programs for use with language handicapped children. Intended primarily for school administrators developing programs, the booklet is also relevant to universities planning teacher education courses or programs and to individual teachers desirous of improving instructional proficiency. Competencies briefly discussed include competent observation practices and use and interpretation of standardized testing instruments (in the area of diagnosis); the establishment of specific instructional objectives and the design and implementation of individualized programs (in the area of instruction); and identification and assessment of target behaviors and analysis of the instructional program (in the area of evaluation). (DB)