Aim of this study is to analyze effect of jigsaw method and to decide its effectiveness on students’ academic achievement. For that purpose students who are studying at elementary science education program are distributed into two groups through true experimental design. Factors threaten the internal validity are either eliminated or reduced to minimum value. Data analysis of distributions, parametric and non-parametric tests are done to answer research question. Further analyses are also done to investigate gender factor in the study. Research revealed that cooperative learning method did not have effect on increasing students’ academic theoretical knowledge achievement. It is also revealed by the study gender has no effect on academic achievement. However it is also concluded that research itself reveals importance of establishing meaning between experiment sessions and academic relationship for the students.