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'''Open architecture''' is a type of [[computer architecture]] or [[software architecture]] that is designed to make adding, upgrading and swapping components easy.<ref name="II2011">{{cite book|author=Clifton A. Ericson, II|title=Concise Encyclopedia of System Safety: Definition of Terms and Concepts|url=http://books.google.com/books?id=uousK00QAREC&pg=PA272|date=12 April 2011|publisher=John Wiley & Sons|isbn=978-1-118-02865-0|page=272}}</ref> For example, the [[IBM PC]] and [[Apple IIe]] have an open architecture supporting plug-in cards, whereas the [[Apple IIc]] and [[Amiga 500]] computers have a '''closed architecture'''. Open architecture systems typically use a standardized [[system bus]] such as [[PCI]] or [[ISA]] that allows multiple hardware manufacturers to produce add-ons. By contrast, closed architectures, if they are expandable at all, have one or two "expansion ports" using a proprietary connector design that may require a license fee from the manufacturer.
Open architecture allows potential users to see inside all or parts of the architecture without any proprietary constraints.<ref>{{cite web|url=https://books.google.com/books?id=Zk2qCAAAQBAJ&pg=PP6&lpg=PP6|title=TRON Project 1987 Open-Architecture Computer Systems: Proceedings of the Third TRON Project Symposium}}</ref> Typically, an open architecture publishes all or parts of its architecture that the developer or integrator wants to share. The [[open business]] processes involved with an open architecture may require some license agreements between entities sharing the architecture information. Open architectures have been successfully implemented in many diverse fields, including the [[US Navy]].<ref>{{cite web|url=http://www.navy.mil/navydata/cno/n87/usw/spring08/HowAndWhy.html|title=The HOW and WHY of OPEN ARCHITECTURE}}</ref>
==See also==
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