"A technology framework to support the design, development, and deployment of diverse business applications in a loosely coupled way. The goal of SOA is to encourage reuse of both data and functionality via the use of units of work (services) that are made available to different business processes across the enterprise." (Jill Dyché & Evan Levy, "Customer Data Integration: Reaching a Single Version of the Truth", 2006)
"There are various definitions for SOA. Some specify only that it is an approach for architectures where the interfaces are services. However, in a more specific sense (and according to my understanding), SOA is an architectural paradigm for dealing with business processes distributed over a large and heterogeneous landscape of existing and new systems that are under the control of different owners." (Nicolai M Josuttis, "SOA in Practice", 2007)
"An architectural style for creating an enterprise architecture that exploits the principles of service orientation to achieve a tighter relationship between the business and the information systems that support the business." (Tilak Mitra et al, "SOA Governance", 2008)
"A way of designing software applications for reusability and flexibility. It involves designing loosely coupled software components called services. See also service." (John Goodson & Robert A Steward, "The Data Access Handbook", 2009)
"An architectural style in which software systems are modular and some components (service providers) are distributable, discoverable, substitutable, and shareable." (W Roy Schulte & K Chandy, "Event Processing: Designing IT Systems for Agile Companies", 2009)
"An architecture that enables IT resources to be made available to other participants in a network as independent services that are accessed in a standardized way without knowledge of the underlying platform implementation." (David G Hill, "Data Protection: Governance, Risk Management, and Compliance", 2009)
"An IT infrastructure that allows disparate applications to exchange data and use consistent processes as they interact with each other. SOA is the foundation architecture for data services. |" (Tony Fisher, "The Data Asset", 2009)
"In its most general sense, an approach for architectures where the interfaces are services. In a more specific sense, it is an architectural style for dealing with business processes distributed over a large and heterogeneous landscape of existing and new systems that are under the control of different owners. The key concepts of SOA are services, interoperability, and loose coupling." (David Lyle & John G Schmidt, "Lean Integration", 2010)
"The software design and implementation architecture of loosely coupled, coarse-grained, reusable services that can be integrated with each other through a wide variety of platform-independent service interfaces." (Alex Berson & Lawrence Dubov, "Master Data Management and Data Governance", 2010)
"An architectural concept that defines the use of services to support a variety of business needs. In SOA, existing IT assets (called services) are reused and reconnected rather than the more time consuming and costly reinvention of new systems." (Linda Volonino & Efraim Turban, "Information Technology for Management" 8th Ed, 2011)
"An application architecture in which all functions, or services, are created with invokable interfaces that are called to perform business processes." (Craig S Mullins, "Database Administration", 2012)
"A software design and software architecture design pattern independent of any vendor, product, or technology and based on discrete pieces of software providing application functionality as services to other applications. For instance, this software design defines how two computing entities, such as programs, interact in such a way as to enable one entity to perform a unit of work on behalf of another entity." (Jim Davis & Aiman Zeid, "Business Transformation: A Roadmap for Maximizing Organizational Insights", 2014)
"An information technology architecture that separates infrastructure, applications, and data into layers." (Robert F Smallwood, "Information Governance: Concepts, Strategies, and Best Practices", 2014)
"Style of architecture based on the concept of service, designed to simplify interactions between architecture blocks while providing the system with significant flexibility. " (Gilbert Raymond & Philippe Desfray, "Modeling Enterprise Architecture with TOGAF", 2014)
"A design similar to a component-based architecture except the pieces are implemented as services." (Rod Stephens, "Beginning Software Engineering", 2015)
"A method for organizing a company's entire information system functions so all information components are viewed as services that are provided to the organization." (Jan L Harrington, "Relational Database Design and Implementation" 3rd Ed., 2009)
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