The effects of facilitating mutual interactions and objective evaluations on the member satisfaction in collaborative problem solving were investigated. In Study 1, satisfaction of collaborating members was factor analyzed. Results indicated that satisfaction consisted of three factors: Task performance, Sense of unity with other members, and Positive changes in cognition. In Study 2, we used two tasks, a well-defined task and an ill-defined task, to experimentally identify the types of interactive behaviors that affected satisfaction. Satisfaction was effected by performance-oriented behavior, maintenance-oriented behavior, and objective evaluation. In the well-defined task, satisfaction was particularly effected by performance-oriented behaviors and objective evaluation, whereas in the ill-defined task, it was particularly effected by maintenance-oriented behaviors.