The scheduling algorithm is put in place to keep the processor busy ... jobs first and must make on-the-spot decisions. For example, when a running process is interrupted and may be changed ...

goptions hpos=80 vpos=43; title f=swiss 'Scheduling Programming Tasks'; title2 f=swiss h=1.5 'Comparison of Schedules'; proc gantt data=progschd graphics; chart / font=swiss increment ... label ...