The institute Quantum Theory of Materials is a member of the Peter Grünberg Institute (PGI-1) and Institute for Advanced Simulation (IAS-1) of the Research Centre Jülich (ForschungszentrumJülich, FZJ). It offers a variety of tools, mainly based on density functional theory (DFT),to calculate and analyse the complex structural, electronic and magnetic quantities of solids and molecules for fundamental research and practical applications. In the IAS it is joined with the Jülich Supercomputing Centre with its unique computational resources.