This is a popular technique that is used with a timer. Here are the six steps:
Decide on a task to be done
Set the pomodoro timer
Work on the task
End work when the timer rings after 25 minutes (one Pomodoro)
If you have fewer than four Pomodori, take a short break (3–5 minutes)
After 4 Pomodori, take a longer break (15–30 minutes), then go back to step 1