Greg McKeown published Essentialism: The Disciplined Pursuit of Less in 2014, and it became one of the most-quoted productivity books of the decade. Which is slightly ironic, because it isn't a productivity book. It argues that getting more done faster is the wrong goal entirely.

Six ideas worth carrying out of it.

1. This is not time management. The essentialist question isn't "how do I fit it all in" — it's "what is the one thing I should be doing, and what am I willing to give up for it." McKeown frames the whole book as the pursuit of getting only the right things done, not more things done.

2. Success quietly destroys the focus that created it. McKeown calls this the clarity paradox: clarity of purpose leads to success, success brings new options and opportunities, those options split your attention, and the diffused focus undermines the clarity you started with. Doing well is what makes you overcommitted.

3. "I have to" is almost always a choice you stopped noticing. The non-essentialist says I have to; the essentialist says I choose to. McKeown argues the ability to choose isn't something you lose — it's something you forget you have, and then behave as though it's gone.

4. The 90 Percent Rule. When evaluating an option, pick the single most important criterion and score the option 0–100 against it. Anything below 90 gets a zero — an automatic no. It sounds extreme, and that's the point: it stops you from accumulating a life made entirely of decent-but-not-great commitments.

5. Build a 50% buffer into every estimate. Kahneman and Tversky named the planning fallacy in 1979 — we underestimate how long things take even when we've done them before. McKeown's fix is blunt: take your honest estimate and add half again. The buffer isn't slack, it's what stops one delay from cascading through the whole day.

6. Run a reverse pilot. Instead of arguing to kill a meeting, report, or commitment, quietly remove it and see whether anyone notices. Most of the time nobody does — and you've got evidence instead of an opinion.

Takeaway

Pick one recurring commitment on your calendar this week — a standing meeting, a report, a check-in — and run a reverse pilot: skip it once, tell no one in advance, and note what actually breaks. Usually nothing does.

The uncomfortable part of the book isn't the advice. It's the premise underneath it: if you don't choose what to cut, your time still gets spent — just by whoever asked most recently.