Summary
Three is a capacity, not a preference: count a real working day honestly and three substantial pieces of work is roughly what is left. Pick them the night before, order them by consequence, and let everything else stay on the list as a backlog rather than a plan.
A long list feels productive and behaves like a tax. Every item you will not do today still costs you a decision, every time your eye crosses it.
Three is a capacity, not a preference
Count a real working day honestly — meetings, replies, the twenty minutes after each interruption — and three substantial pieces of work is roughly what is left. The Rule of 3 is that count, written down before the day argues with you.
- Pick three the night before, while you still have context.
- Order them by consequence, not by how quick they are.
- Everything else is a fourth item, and a fourth item is a maybe.
What it does to the rest of the list
Nothing — the list stays. It just stops pretending to be a plan.
The three are the plan; the list is the backlog.
Where it meets timeboxing
The Rule of 3 decides what. Timeboxing decides when. Neither works alone: three priorities with no times is still a wish, and a full calendar of the wrong work is worse than an empty one. Read what timeboxing is for the other half.