Ivy Lee vs Top 3: which one fits
The short answer
Top 3 caps how much you take on. Ivy Lee governs the order you do it in. They are answering different questions, which is why one works when the other does not.
Pick Top 3 if the day holds more than a day fits. Pick Ivy Lee if the amount is fine but you keep starting things and finishing none.
Side by side
| Top 3 | Ivy Lee | |
|---|---|---|
| What it limits | How many things | What you may start next |
| The problem it answers | Volume | Switching |
| The rule | Three lines, no fourth | Six, ordered, second locked until first is done |
| When you write it | Morning, or the night before | The night before, always |
| Order matters? | No | It is the entire method |
| Fails when | The real problem was never volume | Your first task is blocked, not merely hard |
| Origin | Modern, no single author | Ivy Lee to Charles Schwab, Bethlehem Steel, 1918 |
How to tell which one you need
Look at yesterday rather than at how today feels.
You wrote six things and finished four. Volume was never the problem — you finish what you start. If you also felt scattered, the issue is order, and Ivy Lee is the fit.
You wrote six things and started five. That is switching, and it is what the Ivy Lee lock exists for.
You wrote six things and the sixth was never realistic. That is volume. Top 3.
You wrote nothing. Top 3, because it is the least effortful structure to begin with, and it makes next time easier to read.
What each one costs
Every constraint buys something by giving something up, and the honest version of this comparison says what.
Top 3 gives up sequence. It tells you what to do and says nothing about when. On a day with a genuine dependency — the thing that must happen before lunch so someone else can move — Top 3 will let you leave it until four o'clock in perfectly good faith.
Ivy Lee gives up flexibility, and this is its real risk. In scheduling terms a strict order creates head-of-line blocking: one stuck item blocks everything queued behind it. If your first task is genuinely blocked — waiting on someone, missing information — a rigid reading leaves you stalled at the top of the list while five things you could have finished sit underneath.
The fix is to separate hard from blocked. A hard task is one you do not want to start, and the method exists to get you past exactly that. A blocked task cannot move no matter how willing you are. Move a blocked task down and note what unblocks it. Move a hard task nowhere.
Can you use both?
Yes, and it is the most useful combination available: choose three with Top 3, then order those three and work them strictly.
Be aware of what you are doing, though. Six lines is a lot of ordering; three is a light constraint that still gets you the benefit of sequence. Running the full six-task version on top of a three-task cap is just Ivy Lee with an unused half.
Why three, and why six
Neither number is load-bearing, and any page that tells you otherwise is inventing authority.
There is a real result underneath the general principle. Little's Law, published by John Little in 1961, holds that in any stable queueing system average completion time is proportional to work in progress — halve the number of things in flight and each one finishes roughly twice as fast. It is why Kanban boards cap work in progress.
And here is the part usually left out: Little's Law is a theorem about queueing systems. It is not a finding about human cognition and it names no number. It tells you the direction — fewer things in flight, faster completion — and nothing about whether that number is three, five or six. Three is small enough to force a real decision. Six is a reasonable working day. Both are practical choices, not discoveries.
If you consistently finish three of six, write three. A list that is never completed stops being information and becomes wallpaper.
Where to go next
- The Top 3 method — the full method and how to actually choose the three
- The Ivy Lee method — the 1918 origin and the discipline that makes it work
- How to prioritise your tasks — if neither of these describes your problem
Using them in Decide One
Decide One ships both, and enforces rather than draws them. Three lines will not become four. The second Ivy Lee task will not open until the first is closed — which is the difference between a tool that holds a method and a tool that reminds you of one.
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.