GMD publishes papers documenting advances in all aspects of the techniques and technology employed to model the Earth system. GMD has a particular focus on excellence in open, reproducible science through field-leading requirements for full publication of methods, software source code and model data. A particularly important role currently fulfilled by GMD is as the publication venue for all of the papers specifying the experiments to be conducted as part of the World Climate Research Programme Coupled Model Intercomparison Project phase 6 (CMIP6). The CMIP series provides the primary model inputs to the Intergovernmental Panel on Climate Change (IPCC) assessment reports.