This book provides planners with an initial insight into the complex topic of BIM, specifically tailored to the work of architects. The BIM working method considers a building holistically throughout its entire lifecycle: from design to construction, execution, operation, and finally to demolition, including the recycling of materials. The key to successful BIM implementation lies in the consistent utilization of the technical possibilities of our digital and interconnected world, meaning the development of seamless, collaborative digital processes for the planning, construction, and usage phases of a building. The book outlines the first steps and fundamental questions regarding the new BIM methodology. Key points from the content include: What is BIM? (Concepts, use cases, stakeholders, and processes) // Prerequisites (HOAI, infrastructure).