The friction-free linking enabled by web services (or any SOA). Loosely coupled services, even if they use incompatible system technologies, can be joined together on demand to create composite services, or disassembled just as easily into their functional components. Participants must establish a shared semantic framework to ensure messages retain a consistent meaning across participating services.
Loosely Coupled glossary
Loosely coupled is an attribute of systems, referring to an approach to designing interfaces across modules to reduce the interdependencies across modules or components – in particular, reducing the risk that changes within one module will create unanticipated changes within other modules.
John Hagel's weblog
Doug Kaye's comparision table of tightly coupled and loosely coupled.
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