The BIM (Building Information Modeling) methodology is an approach for integrated digital planning that carries the potential for significant improvements in building energy performance. The method foresees that information from stakeholders like architects, planners, modelers, constructors and even operators feed into the same data source – the BIM model. In the planning phase the model thus becomes the information hub for geometric data, thermal parameter of building elements (walls, slabs, outer shell etc.), the building energy systems (heating, cooling, building automation) and much more. BIM comes in two flavors: there is closed BIM, which restricts cooperation to a limited set of software tools with little to no possibility to cooperate outside a given software environment; and there is open BIM, which is based on the internationally standardized IFC (Industry Foundation Classes) Schema (ISO 16739-1:2018) and allows to interchange modeling data between different software tools from various vendors. Along with IFC there are further open buildingSMART Standards like BCF (BIM-Collaboration Format) and IDS (Information Delivery Specification) as well as IDM (Information Delivery Manual). This project is working with the open BIM methodology. This project addresses the research questions that bring forward the technology and the processes, which constitute successful BIM projects:

1. a common library of BIM definitions to improve seamless data exchange between different software tools;
2. research on improving planning processes and development of guidelines for better collaboration; and
3. gathering experience in use cases that apply the BIM methodology, including both planning and operation of buildings, with a special focus on thermal simulation.