In  a batch job to control the flow of processing & calling other programs

To write simple menu applications & based on the option selected, call the corresponding  program

To handle errors from a command or program execution by monitoring messages

To provide some predefined set of routine procedures for the system operator like saving/restoring of objects or libraries

To control group jobs in an interactive session

To control the jobs that may have to be run at the end of day, end of week, end of month etc.