The purpose of this paper is to discuss about the suitable project on game development.in order to develop the hypotheses. First, I have conducted a review of the prior researches and tested 6 preliminary hypotheses by interview with a long experienced person in the game industry. Then I present refined hypotheses. The hypotheses are related to leadership(hypothessis1・2・3), product genre(hypothessis4-a・4-b), online game(hypothessis5-a・5-b・6).