This session is dedicated to the development and use of infrastructure software for modelling the Earth system with coupled numerical models of full complexity, and aims at bridging the gap between IT solutions in the high performance computing area and Earth System Science. Contributions to this session may address the usefulness of coupling infrastructure and data management, strategies and tools for pre- and post-processing, and software solutions and strategies to support coupled regional and global models. Furthermore our focus is on technically oriented presentations discussing IO, parallelisation, and algorithmic work addressing the needs of Earth system modelling. Other contributions dealing with more general aspects of Earth system modelling are as welcome and heartily invited.