The Connecting Europe Facility created the initiative CEF Building Blocks which will offer basic capabilities that can be used in any European project to facilitate the delivery of digital public services across borders. 

eID, eDelivery, eSignature, eInvoicing, eTranslation represent the Building Blocks that are going to be developed for the benefits of businesses and public administrations across EU Members States. ''The building blocks simplify your project, reduce costs, comply with legislation and work across sectors.''

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Credit to European Commission