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Pre-emptive multitasking with job control assures that a system operates in a timely manner ''most of the time''. In some environments (for instance, operating expensive or dangerous machinery), a strong design constraint of the system is the delivery of timely results in all circumstances. In such circumstances, job control is more complex and the role of scheduling is more important.
Since real-time systems do event-driven scheduling for all real-time operations, "the sequence of these real-time operations is not under the immediate control of a computer operator or programmer."<ref>{{cite book
|url=http://www.bitsavers.org/pdf/sds/sigma/16-bit/rbm/901785A_Real-Time_Batch_Monitor_Users_Guide_Jan72.pdf
|title=Xerox Real-Time Batch Monitor (RBM), Sigma 2/3 Computers, User's Guide
|publisher=Xerox Corporation |accessdate=2017-02-16}}</ref>
==Job control languages==
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