The industrialization of application software development is a key trend in the software industry. One important element of industrialized development processes is the introduction of a division of work with specialized competencies. Cross-functional integration is a fundamental and well established concept in product development. Its potential has also been recognized in application software development. Many enterprise application software vendors have established product management to complement software development from a business perspective, while R+D primarily focuses on technology aspects. Due to the growing significance of usability and user experience, the product design function has become increasingly important for application software development. However, there is little empirical work concerning cross-functional integration of product management and product design in application software development. The work presented in this paper explores success factors of this cross-functional integration.