The user interface is a market-decisive and image-shaping figurehead of a product line. This shows who understands the user best. ERGOSURG realizes customer-specific ergonomic software systems, which safely and efficiently support the workflow of the environment. Decades of experience with the requirements of complex situations, error minimization and the necessity of clear interactions have shaped our concepts. The use of several large screens is supported as well as instrument-integrated mini touch systems. From the PACS/DICOM interface to real-time capable FEM simulation of anatomical structures or for real-time image processing of video image data, the medical user must be able to operate his system intuitively. Of course, our software systems are approved as medical products.