The European Interoperability Reference Architecture (EIRA©) is an architecture content metamodel defining the most salient architectural building blocks (ABBs) needed to build interoperable e-government systems. The EIRA© provides a common terminology that can be used by people working for public administrations in various architecture and system development tasks.  The EIRA© was created in the context of  Action 2016.32 of the ISA² Programme and is being maintained under the Digital Europe Programme (DEP). The EIRA uses (and extends) the ArchiMate language as a modelling notation and uses service orientation as an architectural style. 

The latest version (6.0.0) of EIRA has been released, containing the significant upgrades such as the improvement of views, viewpoints, and ABBs documentation. It  can be considered the state-of-the-art in the interoperability domain for the design of end-to-end interoperable digital public services. Further information about EIRA v6.0.0 can be obtained in the document "EIRA v6.0.0 Online Documentation".

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