One of the strengths of the Pennsylvania Council of Teachers of Mathematics (PCTM) is that it gives mathematicians and mathematics educators the opportunity to exchange and contribute to each other's professional growth. The topic for each yearbook is chosen to coincide with the annual PCTM meeting. This 1987 yearbook contains 14 articles which focus on research, results, perspectives, ideas, and strategies related to mathematics instruction. Topics include: teaching writing in mathematics; teaching reading in mathematics; computer literacy; business education; using computer based materials; relating microcomputers to the mathematics curriculum; textbooks; calculus; discrete mathematics; Pascal; coordinating mathematics programs; classroom methods; using textbooks to teach higher order thinking skills; and mathematics education in West Germany. (CW)