The Reinforcement Science Skills Project of the Cleveland Public Schools is designed to meet the science education needs of urban elementary and junior high school students. The project provides specially designated materials and teacher training in their use at selected and inservice sessions for teachers in nontargeted schools. Results at the elementary level in 1982-83 indicate that (1) 65.2 percent of fifth graders in the selected schools showed a pre-posttest gain of 10 percent on a locally developed test measuring understanding of physical science concepts; (2) although responses to the inservice sessions for teachers from the selected schools were positive, they fell short of the objective level of 80 percent; (3) at least 80 percent of the elementary science teachers in grade 5 who took part in a series of inservice workshops rated them as successful; and (4) elementary science teachers in the nontargeted schools received appropriate inservice training. Results at the secondary level show that students at the selected schools did not attain the targeted gain of a pre-posttest measure of their achievement; junior high school teachers received appropriate inservice training; and the inservice training was judged by at least 80 percent of those receiving it to be successful. (CMG)