Cross-references and box texts with additional information help readers in this navigation. A more causal, analytical assessment of water issues in the identified shared basins may take place as part of future updates of the Inventory. The research process was markedly different for the surface water and groundwater sections of the Inventory. For each basin, information packages were compiled according to the core themes and chapter templates, which were later used, where necessary, as a basis for consultation with countries (Box 2). Research for "Part II: Groundwater" therefore started with the screening of all available geological and hydrogeological information and its interpretation in view of identifying potentially shared aquifers and aquifer systems (see ’Overview & Methodology: Groundwater’ chapter).