How to prioritise your tasks

Updated 2026-09-12

The short answer

Name what is actually going wrong today, then pick the method built for that. There are three problems and three answers.

What today actually feels like	The method that fits
Too much to do	The Top 3 method — three lines, no fourth
I keep starting things and not finishing them	The Ivy Lee method — strict order, one at a time
Everything feels urgent and I cannot tell what matters	The urgent/important matrix — classify before you write

Most advice skips this step and hands you one method for every situation. That is where it goes wrong.

Why choosing the method is the actual work

There is a result in scheduling theory worth knowing, because it settles an argument that otherwise runs forever: no single scheduling discipline is best across all objectives.

Shortest-job-first minimises average waiting time. Earliest-deadline-first is optimal for meeting deadlines on a single processor — that is Liu and Layland, 1973. Rate-monotonic scheduling is the optimal fixed-priority approach for recurring periodic work. None of them beats the others in general, because they are optimising different things.

So when a method does not work for you, the useful question is rarely did I try hard enough. It is usually was this method built for the problem I actually have. Using a strict one-at-a-time order on a day whose real problem is volume will not help, and neither will a matrix on a day when you already know what matters and simply keep not finishing it.

That is a mismatch, not a shortcoming.

How to tell which problem you have

Ask what happened yesterday, not how you feel now.

You wrote a list and got through some of it, but the list was never going to fit in a day. That is volume. Top 3.
You started three things and finished none. That is switching. Ivy Lee.
You were busy all day and the thing that mattered did not move. That is urgency crowding out importance. The matrix.
You did not write anything down and the day happened to you. Start with the Top 3 — it is the lowest-effort structure and it makes the other two diagnosable next time.

If two apply, take the one that describes yesterday more accurately. You can change method tomorrow; changing it at 11am does not work, because by then you are choosing the method that excuses the morning.

The step almost everyone skips

Write down everything competing for the day before you choose any of them.

This sounds like an extra step and it is the one that makes the rest work. You cannot choose between things you have not seen, and a list that lives in your head is both longer and vaguer than the same list on paper. People routinely find the real list is shorter than the felt one.

It also makes the choice honest. Choosing three things from a list of seven is a decision. Choosing three things from memory is a guess weighted toward whatever you were last anxious about.

What prioritising cannot do

It does not create time. If the work genuinely does not fit, no ordering makes it fit, and a method that implies otherwise is lying to you.

What it does is decide what gets the time there is, deliberately and in advance, rather than by whatever arrives loudest. In scheduling terms the failure it prevents is called starvation — low-priority work never running because higher-priority work keeps arriving. The important thing is not forgotten and not deprioritised. It simply never reaches the front.

A twenty-line list does not fix starvation. It records it.

Where to go next

Why to-do lists stop working — what a plain list does to the order of your day
How many tasks should a day hold? — what the arithmetic says, and what it does not
When everything feels urgent — the hardest of the three problems
Ivy Lee vs Top 3 — the two most commonly confused methods

Using this in Decide One

Decide One asks what today looks like before it offers a method, and then enforces the method rather than drawing it. Three lines will not become four. The second Ivy Lee task will not open until the first is closed.

Nothing is scored, and a day you did not open is not counted against you.

Open Decide One — free to use, with no account. Nothing you write leaves your device.

Decide One is a priority instrument. Bring the day into view, choose a method, give the first thing real time.

Open it — free, nothing to sign up for

The Top 3 method: three things, no fourth — Pick three things for today and no fourth. The reasoning is arithmetic rather than willpower: limiting work in progress shortens completion time.
The Ivy Lee method: six tasks, strict order — Write six things tonight, order them, and work strictly top to bottom tomorrow. A 1918 method, its one real discipline, and the failure it can cause.
How to use the urgent/important matrix — Sort work on two axes before deciding what to do. The distinction is from a 1954 speech; the grid came later. How to use it without it becoming busywork.
When everything feels urgent — Urgency is about when; importance is about consequence. They feel identical because urgency is louder. Two named failure modes explain the rest.
Ivy Lee vs Top 3: which one fits — Both limit what you take on, but answer different problems. One caps volume; the other enforces order. Choosing wrong is why a method stops working.
Why to-do lists stop working — A plain list runs in arrival order, the one ordering known to be bad. The problem is not discipline — a list records decisions instead of making it.
How many tasks should a day hold? — There is real arithmetic behind limiting work in progress, and no research establishing a magic number. Here is where the line between them falls.
Is there a best prioritisation method? — No, and that is a formal result rather than a hedge. The right ordering rule depends on what you are optimising for, which is why the question comes first.
Little's Law, applied to a working day — Limiting work in progress shortens completion time, and that is arithmetic rather than willpower. What the theorem says, and what it does not say.
Why your important work never gets done — There is a name for work that waits forever because louder work keeps arriving. It is starvation, and the standard fix is not discipline.
What switching tasks actually costs — A processor does not multitask either; it switches fast and pays for it. The overhead has a name, a mechanism, and a point where throughput collapses.
Frequently asked questions — What Decide One does, what it costs, where your writing is kept, and which of the three methods to start with. Short answers, no sales pitch.
What to do when you have too much to do — First establish whether this is a prioritisation problem or a capacity problem, because the second one does not respond to any ordering rule at all.
Should you plan your day the night before? — The 1918 method that made this famous put the planning at night for a specific reason, and it is not about discipline. What it buys, and what it costs.
Why you can't finish anything you start — Starting is cheap and finishing is not, so a day fills with open work. The gap between them has a mechanism, and closing things beats starting fewer.
How long should a task take? — Nobody can tell you the right number, and it is not the useful question. What an estimate is really for, why accuracy is not the point, and what to do after.
What to do when you can't start — Not starting is usually a decision problem rather than a motivation one. If the first action is unnamed, there is nothing to begin, and willpower cannot help.
Is multitasking real? — A processor with one core does not multitask; it switches fast enough to look like it. What that does and does not tell you about a person doing four things.
Why deadlines work, and what they cost — Ordering by deadline is provably optimal for one objective and quietly bad for another. Knowing which one you are buying is the whole of using them well.
Should you do the hardest thing first? — Two ordering rules answer this and they disagree, because they optimise for different things. Which one is right depends on what today is actually short of.
How to handle constant interruptions — An interruption costs more than the minutes it takes, and the extra is paid on the way back. What a scheduler does about it, and what transfers to a person.
Do productivity systems actually work? — Some of the mechanisms are sound and the claims made for them usually are not. How to tell which part of a system is doing work and which part is decoration.