Is the more always better? A comparative study of internal and external integration practices in new product and new service development

This study investigates the relationship between internal and external integration practices and innovation success of new products and new services. Building on the idea that key success drivers in new product and new service development may have implementing costs besides their obvious benefits, this article examines the possibility that a nonlinear relationship in the shape of an inverted U exists between innovation success and the antecedents examined in this research. The present study also addresses scholars' call for research to investigate differences in the drivers of new product and new service success. The findings suggest that differences exist in the nature of the relationship—that is, linear versus nonlinear—between cross-functional integration, customer integration, and interfirm collaboration and innovation success in a new product versus new service setting.