The participants of this study were enrolled in a general science course in an urban elementary school. In this school, there were 6 fourth grade classes, and a total of 339 fourth grade students. Most of the students’ socio- economic status, including the educational level of their parents and their family income were in the middle-range. Furthermore, the ages of the students ranged from 10 to 11. The participating students were placed in two classes and instructed by the same teacher. The two instruction methods used in this study were randomly assigned to each group. Both the experimental group who received CCICL and the control group who received TI consisted of 28 students. All of the 56 fourth grade students, 26 boys and 30 girls, returned signed parental consent forms for participation in this study.