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 1986 yearbook contains 17 articles related to ideas, suggestions, practices, and programs that have the potential to improve the teaching and learning of mathematics. Topics include: improving academic achievement; the use of concrete examples; Euclidean concepts; the use of daily sequences; how to improve mathematics skills; using mathematics education research to improve instruction; activities involving the Statue of Liberty; whole brain thinking; using models; using computers to teach mathematics; an example of an innovative high school curriculum; Monte Carlo methods; graphing with a microcomputer; process learning in mathematics; developing an achievement test; computer resource centers; and evaluating computer software. (CW)