Interoperability means the ability of information and communication technology (ICT) systems and of the business processes they support to exchange data and to enable sharing of information and knowledge.
European Interoperability Framework for Pan-European eGovernment Services, January 2004
Interoperability, which means achieving the required coherence in the most effective way, can thus be seen as the most important key for e-government. In the architecture context, interoperability means especially that it is necessary to have common integration principles and standards for exchanging information.
Danish Ministry of Science, Technology and Innovation, White Paper on Enterprise Architecture, June 2003
Interoperability is the ability of a system or process to use information and/or functionality of another system or process by adhering to common standards.
European Public Administration Network's eGovernment Working Group report Key Principles of an Interoperability Architecture, June 2004.
The ability of government organisations to share information and integrate information and business processes by use of common standards.
New Zealand E-government Strategy, Dec 2001
The ability of different operating and software systems, applications, and services to communicate and exchange data in an accurate, effective, and consistent manner.
US H.R. 2458 - the E-Government Act of 2002
The ability of information systems to operate in conjunction with each other encompassing communication protocols, hardware software, application, and data compatibility layers.
ICH Glossary
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