This book is based on the premise that learning can best be facilitated when the teacher takes a diagnostic view of the instructional process. To further this end, each chapter contains materials, models, and techniques designed to implement diagnostic teaching in the language arts program. The seven chapters are "Foundations for Diagnostic Teaching," which discusses the diagnostic point of view and suggests basic diagnostic teaching procedures; "Language Tests," which analyzes the uses and limitations of standardized language tests and other testing devices; "Listening," which includes an evaluation of listening disabilities and a checklist of problems; "Oral Communication," which discusses diagnosis of pronunciation, articulation, and usage problems; "Written Communication," which evaluates pupil writing; "Spelling," which discusses causes of spelling deficiencies and strategies for treatment; and "Handwriting," which explores different handwriting styles, common errors, and difficulties involved in learning, and includes diagnostic teaching strategies to improve handwriting. (RB)