Learn in the textbookClassic Solutions and Data Center Services
DefinitionSI (systems integration) is a service that takes on, as one package, an information system from planning through design, development and deployment, shaped around the client's goals.
Explanation"Integration" means bringing things together: the point is to combine products and technologies from several vendors into one system. A company that does this work is called an SIer (エスアイヤー). Whether operation after deployment is included depends on the contract, and a company may hand over only the build and run the system itself.
AnalogyIt is like building a house by leaving everything to one home builder until it is finished, instead of arranging the design, carpentry and wiring separately.
Memory hookThe I is for Integrate. Pulling scattered parts together into one whole is SI.