HetSys is an EPSRC-supported Centre for Doctoral Training. It recruits enthusiastic students from across the physical sciences who enjoy using their mathematical skills and thinking flexibly to solve complex problems. By developing these skills, HetSys will train you to challenge current state-of-the-art in computational modelling of heterogeneous, ‘real world’ systems across a range of research themes such as nanoscale devices, new catalysts, superalloys, smart fluids, laser-plasma interactions etc. The HetSys training programme addresses three key training needs: Span disciplinary barriers. The most challenging real-world heterogeneous systems are intrinsically multidisciplinary, requiring integration of a diverse range of modelling methods. Incorporate uncertainty in modelling. Training in uncertainty quantification will enable students not only to perform simulations, but also to quantitatively assess their reliability. Promote robust Research Software Engineering (RSE). Training in sustainable software development will enhance software usability and extend its lifetime.