Cooperative learning is important by some students.However,in Japan,the number of small classes has increased in schools,and it is difficult to conduct cooperative learning in small classes.This study aims to design an effective approach toward cooperative learning of knowledge construction online.Therefore,a tool was developed for learning through the jigsaw method online(OnlineJigsawSystem).Through a questionnaire survey,the study compared the learner's attitude toward cooperative learning with the jigsaw method using the OnlineJigsawSystem and cooperative learning with the normal style of the jigsaw method.The results suggest that the learner's attitude toward emotion is almost the same with both approaches.However,there are some problems with "Motivation" and "Human relationship."