DEFINITION: EIRA Architecture Building Block ABB is a Business Object acting as a requirement of an intermediate level of granularity, in alignment with at least one EIF principle, formulated as an agreed normative statement in functional terms on a legal, organisational, semantic, or technical attribute of a To-Be European Public Service. An EIRA ABB might encapsulate several interoperability aspects Source: Europa (https://ec.europa.eu/digital-building-blocks/wikis/display/CEFDIGITAL/What+is+a+Building+Block) EXAMPLES: The following implementation is an example on how this specific Architecture Building Block (ABB) can be instantiated as a Solution Building Block (SBB): A Legal Act is an EIRA Architecture Building Block from a Legal view perspective.