This self-instructive workbook focuses on a set of propositional abilities related to learning. It utilizes written materials, manipulative materials, videotapes, and students, and is supplemented by a program and support system which includes instruction, teaching experiences for practice, discussions, and individual conferences. The three major goals of this workbook are to enable the teacher to: (1) use a clinical method to administer, at any grade level, diagnostic tasks related to propositional abilities; (2) identify the developmental level each student in the class has attained in terms of propositional abilities; and (3) select, from resources available, subject matter appropriate to identified levels of development. Propositional tasks are included which deal with various types of reasoning (probablistic, disjunctive, combinational, propositional, deductive, and proportional). The workbook contains outlines for eight self-directed workshops some of which concern (1) developing the ability to administer propositional tasks, (2) administering propositional tasks to a student, (3) solving problems involving propositional abilities, and (4) reading about propositional abilities. There is also a section dealing with a review of some research on propositional abilities, a bibliography, and an appendix which gives examples of various types of problems related to propositional abilities. (BD)