Of all the productivity folk wisdom, this one has the best pedigree. Pick your top three tasks; do those first. It's the Ivy Lee method from 1918 with a haircut, it's "most important tasks" from a hundred blogs, and unlike a lot of the genre, it genuinely works. I've run a version of it for years, and it's built into how ka-do thinks about a day.
So this isn't a debunking. It's the fine print: why it works, which tells you exactly when it stops working, which nobody puts on the poster.
Why it works
Three does two jobs at once. It kills choice paralysis: a list of forty items and a free hour produces dithering, while a list of three produces starting, because the decision was pre-made. And it forces the prioritisation that an open list lets you dodge forever. Choosing three means demoting thirty-seven, out loud, to yourself, and that act (mildly uncomfortable, every time) is the actual product. The three aren't magic. The choosing is.
There's a subtler benefit underneath: three is small enough to survive a real day. A plan you can hold in your head doesn't need consulting, and a plan that fits around interruptions doesn't shatter at the first one.
When it doesn't work
The method fails in one specific, predictable way: when the three ignore the day they're supposed to happen in. "Top three" answers what matters most. It says nothing about what fits, and those are different questions. Three deep pieces of work on a day with five meetings isn't a priority list; it's fiction with a ranking. You end the day nought-for-three, conclude the method doesn't work for someone as busy as you, and go back to the forty-item list.
The other failure is subtler: the three become a ceiling. The day goes unusually well, the three are done by two o'clock, and with no agreed next-in-line you drift into email for the afternoon. The method needs a bench, not just a starting lineup.
My twist: three, sized, with candidates behind them
The version that survives contact with real weeks has three parts. First, the three, chosen honestly. Second, sized: each carries a rough effort, and the total gets checked against the hours the day actually has once the meetings are subtracted. If it doesn't fit, something demotes now, on Monday morning, rather than silently failing by five. The top three should be the top three that can happen today, which some days means one big thing and two small ones, and some days means three phone calls. That's not lowering the bar. That's the bar being real.
Third, candidates: a short bench behind the three, agreed in advance, so a good day has somewhere to go and a bad day has nothing extra to feel guilty about. The bench is allowed to roll forward untouched. That's what benches are for.
How ka-do handles it
This is, more or less literally, ka-do's model of a day. High priorities are capped, deliberately, so three means three. Candidates sit behind them by design. Every task carries an effort, and Plan My Day does the arithmetic the poster version skips: your three, against your actual remaining hours, with a plain verdict before the day starts. Fits, or something moves.
What ka-do won't do is pick the three for you. No algorithm ranks your work, because the choosing is the product, and it's yours. The app just makes the choice honest about time, and gives the unchosen somewhere respectable to wait.
Honesty clause: on build-heavy days my "three" is sometimes one task, repeated, with delusions. The sizing check is what catches me: the tool has no interest in my optimism.
The one-line version
Top three works because choosing is the point. It fails when the three ignore the clock. Pick three that fit the actual day, keep a bench behind them, and let the method finally do what the poster promised. The same clock-blindness trips up the two-minute rule, for a subtly different reason.
Ka-do caps your priorities and checks them against your real hours. Try it free →