Real time, data is processed instantly, Batch, data is collected and processed in a single operation at a set time, Multi-user processing, A system that involves many users at different computers sharing the processor of a powerful computer, example of real time, air traffic control systems, example of batch, payroll system, advantage of real time, systems are always up to date, disdavantage of batch, system not ‘up-to-date’ until batch is processed.

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