Abstract
In the case of business that companies plan, develop and provide products to consumers based on market and competitors, numbers of sales and profits largely depend on the quality of their product plan. Therefore, it is necessary to complete various analysis, hypothesis formulation, and feasibility study within a given period. Then, we developed a management system for product planning to improve the quality of the product plan during planning phase. The feature of this system is to visualize quantitatively progress of the planning phase focusing on consistency based on dependency among planning tasks as well as task completion using "Task completion rate" and "Consistency rate" as indices. We apply the system to a product plan of an AV equipment to verify feasibility and the effect.