DEFINITION: Digital Solution Service ABB is an Application Service representing an explicitly defined shared application behavior of an Digital Solution. Source: ArchiMate® v3 (http://pubs.opengroup.org/architecture/archimate3-doc/chap09.html) INTEROPERABILITY SALIENCY: IoP Dimension: Behavioral IoP The Digital Solution Service ABB is salient for technical interoperability because it is a central element the EIF's conceptual model for integrated public services. it represents the generalisation of all application services provided by an Interoperable European Solutionas as stated in the EIF: "Technical interoperability the applications and infrastructures linking systems and services." EXAMPLES: The following implementation is an example on how this specific Architecture Building Block (ABB) can be instantiated as a Solution Building Block (SBB): EU Login EU Login is the European Commission's user authentication service. It allows authorised users to access a wide range of Commission web services and websites, using a single email address and password. EU Login implements the single sign-on functionality. Source: (https://webgate.ec.europa.eu/cas/help.html)