This yearbook contains 20 articles pertaining to geometry instruction. Part 1 considers "Perspectives," with articles on the van Hiele model, resolving dilemmas, implications of using computer graphics, chances of geometry surviving in the secondary curriculum, and role of Euclidean geometry. Part 2 provides "A View of Problem Solving and Applications"; articles concern using geometry for teaching problem solving in grades K-9, creative geometry problems, using Logo in secondary school geometry, and some modern uses of geometry. "Activities in Focus" is the topic of part 3; articles consider activities with squares in elementary school geometry, spatial perception in primary grades, investigations with similarity in middle grades, constructing polyhedra, and conic sections. In part 4, "A Look at Geometry and Other Mathematics," are articles on probability in high school geometry, mathematical applications of geometry, calculus readiness, and geometric counting problems. Finally, part 5 contains two articles under the heading of "Preparing Teachers," one focusing on activities based on cognitive research, and one on college geometry courses. (MNS)