This publication provides background information, ideas, and sample activities to help teachers in their efforts to aid students in developing problem solving skills. It provides an overview of the stages in the problem solving model recommended in the elementary mathematics program of studies. Several clusters of problem solving strategies are suggested for each stage of the model. Additional ideas on organization for instruction, the use of textbooks, and sources of problems and problem solving materials are included in a reference list. The document is divided into sections on problem solving as the focus of the curriculum, a general framework for problem solving, the problem solving model, planning for instruction in grades 1 and 2 and in grades 3 through 6, using the prescribed learning resources, and working through the model. Extensive classroom materials follow, such as sample problems for grades 1 through 6, calculator problems, computer problems, and challenge problems. (MNS)