The establishment of the ELN-to-ELN mapping process in ELNdataBridge needs the customization of the planned data exchange using the mapping of the ELNs' content as described before. The UI allows researchers to configure the required aspects of the ELN-to-ELN data exchange and to map and configure the transfer of single values and entry types between different ELNs. In a first step, a connection between the ELNs is established by the generation of a new synchronisation instance. This requires the entering of necessary information such as the name, URL, and token or password assigned per ELN instance and user of the instance (Figure ). In the next steps 2 and 3, the setups of ELN A, e.g. Chemotion, and ELN B, e.g. Herbie, have to be configured (Figure , exemplarily for ELN A). The updating of connection details and the configuration of essential properties are critical steps to ensure a smooth synchronisation process in ELNs. The choice of properties encompasses decisions such as whether to include all existing entries in the synchronisation or only those last updated after a specific timeframe. Additionally, consideration must be given to whether the automatic generation of new entries should be permitted within the ELN environment. Given that projects and activities in Chemotion are structured within collections, synchronisation hinges on choosing one within your user account to establish the initial link between ELNs. In contrast, Herbie lacks a comparable feature; hence, no additional outline element necessitates selection.