DEFINITION: Architecture Requirement ABB is a Requirement being formulated as an agreed normative statement of a To-Be European Public Service Source: European Commission, ISA Programme (https://ec.europa.eu/isa2/sites/default/files/eif_brochure_final.pdf) EXAMPLES: The following implementation is an example on how this specific Architecture Building Block (ABB) can be instantiated as a Solution Building Block (SBB): Stating that "an online support system is required" is considered an architectural requirement for the design of software. Source:(https://www.brainkart.com/article/Functional-Requirements---Software-Architectures_11271/#:~:text=The%20following%20are%20examples%20of%20explicit%20architectural%20requirements%3A,Functionality%208%20Usability%209%20Reliability%20More%20items...%20)