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System integration is an engineering practice that aims to bring component subsystems into one large integrated system, where all subsystems function together as one. The subsystems are already existing but running independently of each other without any over-arching general control being in place.
A system integration engineer uses their skills in software and hardware engineering, as well as experience with interface design and general problem solving skills to find solutions to linking subsystems together...
Strategies for integration vary depending on the pre-existing sub processes, and the desired abilities of the integrated system.
System integration adds value to a group of systems by allowing them to interact with one another and by offering a centralised control and data collection location.
An example might involve an automated assembly line that automatically notifies warehouse personnel when a batch is done. The warehouse system could then dispatch a forklift while locating a storage location. At the same time it could place an order for more raw materials to replace those used in the manufacturing process. All this information could be sent to an accounting system to calculate costs and profits.