The presented research approach is oriented toward the general problem of sustainable product development and more specifically, the idea of convergent use of advanced CAD/CAE/CAM capabilities is targeted as instrument to provide sustainable integrated engineering. A complex conceptual model for the convergent use of integrated engineering tools as strategy for sustainable product development is proposed and discussed in the paper. As case study, the paper subjects to discussion the problem of identifying, selecting, combining and aligning the best options to the needs, for the CAD/CAE/CAM/PDM activities within the process of product development for complex injection moulds designated to automotive industry. Finally, some adequate conclusions of the research approach are presented, oriented mainly in the direction of how a product developer should manage its integrated engineering activities.