The current document provides an overview of the data and Information and Communications Technology (ICT) requirements of the users emerging from the sciences cases in the eLTER PLUS project (see paragraph 3.1 and 3.2 for the description of the users dentified for defining user requirements). These findings are used to derive functional (i.e. the behaviour of essential features of the system) and non-functional (i.e. the general characteristics of the system) requirements for the Information Technology (IT) infrastructure and services, as well as to focus on data needs for large-scale analyses. The content will be used to design and further develop IT components in WP11. This document is a first iteration of user requirements and their implications for eLTER ICT development presenting high-level user stories collected following a user centric approach. As development proceeds during the project and research advances, it will certainly be a living document in the sense that acquired knowledge will inform and influence further iterations of development, for instance by updating the proposed use cases in cooperation with stakeholders.