Among the applied time management tools there is a tool Agile Results.

Its essence is simple, and can be expressed in one phrase, «Rule of Three.»

Every day, instead of trying to solve all the problems, subtasks and projects, you choose the three highest priority tasks. And the day is considered successful if all three tasks are solved, regardless of the solution of the remaining tasks.

Also, three main tasks are selected for a month. And for the year, three main tasks are chosen (or is it more correct to say the project).