The need for Persistent Identifiers (PIDs) to permanently and reliably identify the resources linked to research processes, the actors and their research products is now recognized as a fundamental principle. This is made visible by the implementation of PIDs in central, national and international initiatives around Open Science, e.g.

• in the code of conduct "Guidelines for Safeguarding Good Scientific Practice" of the German Research Foundation (DFG), which calls for scientific source code to be persistently addressed;
• in the National Research Data Infrastructure (NFDI) of the German federal and state governments, which is designed according to FAIR principles (cf. here);
• in the European Open Science Cloud (EOSC), for which a "Persistent Identifier Policy" has been developed;
• in the "Plan S" of several research funding organizations (the "Coalition S");
• in the activities of the Research Data Alliance (RDA), in which a working group for "National PID Strategies" has been formed.

In the course of the project, information on national and international PID initiatives will be successively expanded. The PID Forum offers a first entry point.

PID Network Germany closely collaborates with PID4NFDI, the basic service for persistent identifiers in development for the German National Research Data Infrastructure (Nationale Forschungsdaten­infrastruktur – NFDI). Both projects have an overlap in partners (DataCite, Helmholtz Open Science Office and TIB – German National Library of Science and Technology) and are hence aligned through bilateral coordination and a well-established exchange of information, which is important due to the different scopes of the projects: PID Network Germany addresses the wider scientific and cultural sector, covering an extensive range of PID application areas beyond research data (management) and with a focus on a wide variety of use cases and stakeholders. PID4NFDI focuses on PID implementation in the context of NFDI and especially within NFDI consortia with analyses of specific use cases. PID Network Germany can use and integrate results and findings from PID4NFDI, and vice versa: For example, the national PID roadmap to be released by PID Network Germany will be adapted by PID4NFDI in developing PID guidelines for NFDI, while in turn PID-related NFDI activities and perspectives are contributed to PID Network Germany by PID4NFDI.