Building Performance Simulation (BPS) is a set of computer-generated calculations that help designers compare design options and predict anticipated energy consumption, daylight availability, thermal and visual comfort in buildings. BPS is key to reach Zero Net Energy and Carbon Neutrality in building design. A diverse group of experts from Arup, WRNS Studio, ENERlite Consulting, and Lionakis will discuss their methods and tools to reach those goals. In this session, the results of a survey about BPS strategies will be reviewed, followed by a discussion with four experts about their design workflow and the tools they use. Strengths and limitations of the tools, quality assurance of the outputs, benefits and challenges of BPS will be discussed.