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New product development(NPD) projects have several stages. Individual stages require different level of cross functional integration or functional cooporation. This study examines two relationships: first, relationship between required level of the integration, and project characteristics and environment uncertainty; second, relationship between appropriateness of actual integration and technical and financial success of NPD projects. It is found that R&D-Manufacturing integration is required mostly at the stage of process development, and R&D-Marketing integration is required mostly at the stage of commercial preparation. Factors that affect required level of integration are key technology, organizational structure, product newness in the market, market competitiveness, and speed and sophistication of the applied technology. It is also found that R&D- Manufacturing integration shortens commercialization period and appropriateness of R&D-Marketing integration increases possibility of technical success. However, it is not found that there are any relationships between the appropriateness and financial success.