Every technique so far has helped you work within a session. This one determines which sessions actually happen.

The first rule is deliberately direct: do not begin the day without a plan.

This does not mean scheduling every minute. It means creating a short, written list that defines what matters that day. Make it before the day begins, instead of allowing incoming demands to build it for you.

Why does this matter so much? Without a plan, you make decisions in the moment, and the moment is not neutral. Your attention is likely to go to whatever is loudest, most recent or most stimulating.

A plan made the previous evening comes from a position of greater perspective than the one you may have at 10am with your inbox open.

The second rule concerns order: work according to priority. There is rarely enough time to complete everything.

That second point is the honest reason for planning. A plan is not a tool for getting everything done. It helps you choose what will not get done, deliberately, instead of allowing that decision to be made for you at the end of the day.

Keep the priority system simple. You might use hot, warm, cold, now, soon, later or A, B, C. Three categories are enough. An elaborate system can easily become a way of planning instead of working.

To make the plan more likely to happen, combine it with Lesson 6. Do not only decide which task is most important. Decide which hour you will give it.

A priority without a place in the calendar often remains unfinished. This is one of the most common ways a good plan turns into an ordinary, reactive day.

Use three categories, but place a limit on the highest one. The practical problem with almost every priority system is that everything eventually becomes urgent.

A useful rule is to have no more than three top-priority items in one day. If a fourth appears, something else must move down. That may feel uncomfortable, but it is the purpose of prioritising. A list on which everything is a priority is simply a list.

Expect your first plans to contain too much. Almost everyone underestimates how long tasks will take. The correction is not greater discipline. It is better data.

Estimate the time before each task and record the actual time afterwards. After two weeks, you will begin to see your personal multiplier. For many people, tasks take between 1.5 and 2 times longer than expected. Your multiplier may be different, and knowing it is more useful than adopting another planning method.

Why is recording your estimates more effective than trying to plan better? Because underestimating is not a reasoning error you can simply talk yourself out of. You may underestimate again tomorrow, even after being wrong today, because plans usually assume that nothing unexpected will happen.

A measured multiplier removes the need for that argument. You do not have to feel convinced that a task will take 90 minutes. You only need to apply the number your own records have shown you.