Answer - 1. The timer in CPU is set to interrupt every N milliseconds where this N is called the time slice. 2. It is the time each user gets to execute before control is given to next user. 3. At the end of each time slice the value of N is incremented and the record is maintained. 4. It also maintains the record of the total time user program has executed thus far. 5. This method helps in time sharing among the various users.