Open system may refer to:

Technical term

* Open system (computing), one of a class of computers and associated software that provides some combination of interoperability, portability and open software standards, particularly Unix and Unix-like systems *

Open system (systems theory) An open system is a system that has external interactions. Such interactions can take the form of information, energy, or material transfers into or out of the system boundary, depending on the discipline which defines the concept. An open syste ...

, in the natural and social sciences, a process that exchanges material, energy, people, capital or information with its environment * Open system (thermodynamics), in thermodynamics and physics, a system where matter and energy can enter or leave, in contrast to a closed system where energy can enter or leave but matter can not *

Open system (control theory) A feed forward (sometimes written feedforward) is an element or pathway within a control system that passes a controlling signal from a source in its external environment to a load elsewhere in its external environment. This is often a comman ...

, a feedforward system that does not have any feedback loop to control its output in a control system * Open system, in management science a system that is capable of self-maintenance on the basis of throughput of resources from the environment *

Open and closed system in social science Open or OPEN may refer to: Music * Open (band), Australian pop/rock band * The Open (band), English indie rock band * ''Open'' (Blues Image album), 1969 * ''Open'' (Gotthard album), 1999 * ''Open'' (Cowboy Junkies album), 2001 * ''Open'' (YF ...

* Open system of learning, where information is sourced from multiple sources *

Open government Open government is the governing doctrine which sustain that citizens have the right to access the documents and proceedings of the government to allow for effective public oversight. In its broadest construction, it opposes reason of state and ...

, system * Open-system environment reference model, one of the first reference models for enterprise architecture * Open Distribution system (Example:

Peer-to-peer file sharing Peer-to-peer file sharing is the distribution and sharing of digital media using peer-to-peer (P2P) networking technology. P2P file sharing allows users to access media files such as books, music, movies, and games using a P2P software program tha ...

system)

Proper name

Open Systems Interconnection The Open Systems Interconnection model (OSI model) is a conceptual model that 'provides a common basis for the coordination of SOstandards development for the purpose of systems interconnection'. In the OSI reference model, the communicatio ...

(IT company) *

Open Systems Accounting Software Open Systems Accounting Software (OSAS) is a business accounting software package for small- to medium-sized businesses using the Microsoft Windows, Linux, and Mac OS X operating systems. It has been developed and sold since 1976 by Open Systems ...

(product), an accounting and business software * Open Systems International, supplier of open automation solutions for utilities in the electric, oil & gas, transport, and water industries * Open Systems AG, a company headquartered in Zurich, Switzerland *

Open-source software Open-source software (OSS) is computer software that is released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software and its source code to anyone and for any purpose. Op ...

, system (product) * Open publication, system (non-standard term) The system in which the exchange of both mass and energy take place through surrounding environment {{disambiguation