We study the development and design of digital platforms from the perspective of various players. On the one hand, we are interested in the question of how platform companies such as Apple, Microsoft or SAP can successfully design and manage digital platforms. On the other hand, we research the role of start-ups and SMEs in this context as well as the effects of increasing "platformization" on traditional sectors such as production, health or education. Our research provides important insights into the governance and evolution of digital platforms and ecosystems as well as their appropriate regulation with the aim of integrating digital innovations into society in a sustainable and responsible manner.