Batch Processing: In batch processing Operating systems the tasks are performed in batches os waits for a batch of tasks to arrive and performs the operation on the batch.

Time Sharing: in time sharing operating systems the operating systems shares the time between the tasks i.e. if job A takes 6 minutes to complete and the predefined time to the os is 2 min it first performs the first job A for 2 minutes then takes up job B(the next one) and this way shares its time between all the jobs arriving.

Multi programming: In multiprogramming batch operating systems the multiple jobs are performed by the operating system simultaneously at a time.