This study identified factors related to the satisfaction with collaborative problem solving efforts and investigated the differential effects of these factors. In Study 1, a total of 240 university students participated in research. The research was a qualitative data analysis of group members' descriptions of their collaborative problem solving experiences. The results suggested that satisfaction was determined by a number of factors, especially changes in self-cognition, changes in others' cognition, and inclusion of the other in the self. In Study 2, the differential effects of each factor related to task conditions were examined. The factor of changes in self-cognition and inclusion of the other in the self influenced satisfaction, regardless of the task condition. In a well-defined task, group and personal performance were increasing members' satisfaction. For an ill-defined task, trust of the other members was increasing members' satisfaction. We concluded that satisfaction with collaborative problem solving was influenced by not only task performance, but also emotional and cognitive factors.