Rule of three.

For those who aren't good with numbers or can't do nine things a day, Chris Bailey, author of My Productive Year, came up with the rule of three. It says that to achieve productivity, it is enough to do the three most important things every day. Instead of wasting your energy and attention on a couple of dozen items on a checklist, just pick your three most important tasks for the day and focus on them. The next day, choose three more, and so on. This way you will stay focused. The same rule can be applied to setting goals for the week, month or year.