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 1988 yearbook contains 27 articles which focus on critical issues regarding the goals of school mathematics and related issues, perspectives, ideas, and strategies of interest to mathematics teachers, teacher educators, mathematics supervisors, and curriculum coordinators as they strive to review and improve existing mathematics programs. Topics include: future concerns; changes in elementary mathematics programs; high school calculus courses; change in response to technological development; expert systems and artificial intelligence; preparation of students for secondary mathematics; implications of change for teacher preparation; mathematical thinking; effective textbook use in the elementary school; cooperative learning in mathematics; how to use infinities; and continuing education in the future. (CW)