Prof. Niels Henrik Mortensen, Head of Section of Engineering Design & Product Development, DTU-MEK, In more than 20 years, Professor Niels Henrik Mortensen has studied 200+ industrial projects on modularity and developed a state of the art method for developing product families. The presentation explains how modular product development can significantly reduce time to market for new products. Also, the innovation level can be increased due to a more focused approach. The basic principles will be described: Interfaces stable over time, right number of architectures and scalability of key systems and modules.