This yearbook discusses instructional approaches that are consistent with the reformulation of the school mathematics curriculum by the National Council of Teachers of Mathematics (NCTM). Articles included cover: (1) Pennsylvania standards for mathematics programs (including goals, curriculum, instruction, evaluation, teachers, and administration); (2) metacognitive skills; (3) cooperative learning in calculus; (4) teaching the language of mathematics; (5) problem solving with number operations; (6) teaching geometry; (7) problem solving strategies; (8) learning from real life; (9) using realistic applications; (10) applied geometry; (11) mathematical modeling; (12) use of estimation; (13) geometrical probability; (14) computer based approaches in calculus; and (15) changes in teacher education. (YP)