The premise of The One Thing is a deliberate provocation aimed at the to-do list itself: instead of asking 'what are today's priorities,' plural, ask a single focusing question — 'what's the one thing I can do such that, by doing it, everything else becomes easier or unnecessary?' The book argues that success is rarely the sum of many balanced efforts; it's usually the disproportionate result of a small number of well-chosen actions, and most task lists actively obscure which actions those are by presenting everything at equal visual weight.
Why 'balance' is treated as the enemy
A recurring argument in the book is that the popular idea of a balanced day — a bit of everything, evenly spread — is actually a recipe for mediocrity across the board, because the highest-leverage work usually needs an uninterrupted, disproportionate block of time to produce anything meaningful. Fragmenting that block across a 'balanced' schedule of small chunks produces the feeling of progress on many fronts without the actual output any single front would need to move.
This is closely tied to a domino-chain idea: work is sequenced so that today's one thing makes tomorrow's easier, this month's one thing makes next month's easier, and so on — a single narrowing chain of priorities from a five-year goal down to what you should be doing in the next hour. For a practical software example related to managing multiple clients efficiently, see it here.
The cost the book is upfront about
Committing serious time to one thing necessarily means other reasonable, even important tasks get less attention than they 'deserve' on their own terms. The book is explicit that this creates real short-term friction — colleagues or family members who feel a request was deprioritized aren't wrong that it was. The method only works if the one thing is genuinely chosen for its leverage, not for its comfort; otherwise it becomes a socially acceptable way to avoid everything uncomfortable under the banner of 'focus.'
- The focusing question is meant to be asked at multiple time scales — life, year, month, week, day, hour — not just once in the morning.
- A daily 'one thing' still needs a protected time block; naming it without scheduling it changes nothing.
- Expect friction from people whose requests land outside the chosen priority — that friction is a predictable cost, not a sign the method is failing.
- The method assumes you can identify genuine leverage. If your five-year goal itself is vague, the daily question just produces a confident-sounding wrong answer.
Where a single-focus rule is the wrong tool
Roles built around reactive service — support, operations, anything where your job is largely to respond to what arrives — don't map well onto a single chosen priority, because the job's value is partly in availability, not in output on one chosen track. The method fits builders and planners better than it fits responders, and applying it rigidly in the wrong role mostly produces guilt about the 'one thing' not getting done, rather than better outcomes.
Whether or not you adopt the book's specific domino framing, the underlying discipline — asking what would make the rest of today's list easier or unnecessary, before doing any of it — is a genuinely different question than 'what's urgent,' and it tends to surface a different answer. For additional background on this subject, consult Todoist’s productivity methods.