A pretest-posttest control group design was used in a classroom experiment designed to determine whether the problem-solving performance of second grade students would be affected by systematic instruction in estimation. Participants were 36 students in two groups who were given daily lessons in measurement. The experimental group received a daily…

This action research project sought to develop students' critical thinking skills by implementing a variety of instructional strategies. Targeted for this study were students in one early childhood special education program, one kindergarten class, and one eighth grade science class. The deficit in critical thinking and problem-solving skills was…