Digital research products from the Earth System Sciences (ESS) are increasingly difficult to find, access, use, and share. There is a need for a platform that provides a coherent view on existing products, sources and information on how to use these and at the same time addresses specific needs of the ESS community. The OneStop4All addresses that gap and will function as the central access point to the NFDI4Earth services. Its content will be provided by and for NFDI4Earth members and the ESS community. This deliverable describes the approach to the requirements analysis and concept design of the OneStop4All as part of the software implementation process.