Managing by Henry Mintzberg: Book Notes

TL;DR

• Mintzberg watched managers instead of theorizing about them, and found the job is fast, fragmented, interruption-driven and mostly spoken — not the calm «plan, organize, command, coordinate, control» of the textbooks.
• His model puts managing on three planes at once: information, people and action. It is a lens for seeing your own week, not a recipe.
• The core finding has held up for 50 years and keeps getting worse: modern time-use data shows executives still work in short bursts.
• Management is a craft learned by doing, he argues — not a science and not a profession you can certify with a degree.
• Verdict: the ideas are durable, the 2009 book is dense and descriptive. Read our notes, then read his short 1975 article for free.

Verdict

«Managing» is right about the thing that matters most and clumsy about telling you what to do with it. Henry Mintzberg proved, with a stopwatch and a notebook, that real managerial work looks nothing like the tidy diagrams. That finding is one of the most replicated in management. The problem is the book: 300 pages, heavy footnotes, and a habit of describing the job rather than helping you do it.

So the rating is «Read our notes instead». You get the working model here. If you want Mintzberg in his own words, skip the doorstop and read his 12-page 1975 article — it carries 80 percent of the payload.

The big idea

Classical theory said a manager plans, organizes, coordinates and controls, in that order, from a quiet office. Mintzberg followed managers around and saw the opposite: a relentless stream of short, varied, interrupted activities, conducted mostly by talking. The job is not reflection. It is triage at speed.

«Managing» updates his 1973 study with a fresh look at 29 managers, each shadowed for a full day, across business, government and the nonprofit world. The claim is that beneath wildly different titles, the shape of the work is the same — and it is a practice, closer to a craft than to engineering.

Key ideas

• The job is oral and fragmented. In his 1973 data, the median time a manager spent on a single issue was about nine minutes (Mintzberg, 1973). Managers preferred talking to reading, and the current and specific to the aggregated and abstract. Strategy does not arrive in a memo; it accretes in conversations.
• Managing happens on three planes at once. Through information you communicate and control; through people you lead and connect; through action you actually get things done. Good managers move fluidly between planes — «never too much and never too little» on any one, as the book puts it.
• The ten roles. His earlier framework — figurehead, leader, liaison, monitor, disseminator, spokesperson, entrepreneur, disturbance-handler, resource-allocator, negotiator — still underpins the model. Every job contains all of them; the mix, not the list, is what changes.
• Management and leadership are one thing. Mintzberg rejects the fashionable split. A leader detached from the daily work is not inspiring, just uninformed. His line, «we are overled and undermanaged», is the book’s sharpest sentence.
• It is a craft, not a profession. You cannot certify a manager the way you certify a surgeon. The competence lives in judgment built from experience, context and a bit of art — which is why he distrusts the idea that a classroom can manufacture managers.
• The conundrums have no exit. The book lists thirteen unavoidable binds — the superficiality of a packed day, planning without time to plan, delegating what only you know. Mintzberg’s honest answer is that you do not solve them. You balance them, badly, forever.

What holds up

The central finding has aged remarkably well. When Michael Porter and Nitin Nohria tracked 27 chief executives across roughly 60,000 hours, the pattern held: a 62.5-hour week, 61 percent of it in face-to-face contact, the day sliced into meetings and hand-offs (Porter and Nohria, 2018). The modern executive is as interrupted as Mintzberg’s 1970s sample, only now the interruptions arrive by screen too.

The fragmentation Mintzberg described has, if anything, intensified. Gloria Mark’s team found that a single interruption costs about 23 minutes to fully recover from (Mark and colleagues, 2008), and her later work tracked average attention on a screen collapsing to under a minute. Mintzberg diagnosed the disease before the smartphone poured fuel on it. If you are rebuilding your own attention around this, our guide to how the brain handles interruption pairs well with his diagnosis.

His «overled and undermanaged» warning also reads as prophecy. The leadership-industrial complex he mocked in 2009 only grew. We take up the same fault line in our notes on leadership beyond effectiveness.

What doesn’t

Mintzberg describes the job beautifully and then mostly stops. «Managing» is diagnosis, not treatment. His thirteen conundrums end in a shrug — learn to live with the uncertainty — which is true and also unsatisfying when you are the one drowning in it. Reviewers noticed: the book is «much too thick», thick with self-reference, and its fieldwork was gathered largely in the 1990s from mostly non-American managers (de Waal review, HPO Center).

The three-plane model is a lens, not a tool. It helps you see where your week is lopsided, but it will not tell you what to cut on Monday. And his blanket case against management education overreaches. His companion book argues that MBA programs train the wrong people the wrong way (Mintzberg, 2004), yet plenty of capable managers pass through those programs and plenty of disasters never did. The classroom is a weak teacher of craft, not a poison. If you are weighing that credential as a career move, treat it as one input among many — our take on career and money decisions and on judgment under uncertainty is more use than a slogan.

Why the tools outlive the theory

Strip the book to its usable parts and three tools survive.

• The three planes as an audit. Once a week, ask which plane ate your time. All information and no action means you are a commentator; all action and no people means you are a bottleneck. The value is the imbalance it exposes.
• The nine-minute reality check. If your job is genuinely fragmented by design, stop grieving the loss of long focus blocks and start protecting a few on purpose. Fragmentation is the default, not a personal failing — which is exactly why deliberate structure beats willpower. Our comparison of time systems is built for precisely this fight.
• Managing as craft. If competence comes from reflected-on experience, then a short weekly review of what you actually did beats another framework. Watch yourself the way Mintzberg watched his 29 managers.

Who should actually read it

Read the full book if you are a scholar of management, or a new manager who needs proof that the chaos of your day is normal and not a sign you are failing. The reassurance alone is worth the price.

Do not read it if you want a playbook. It has none. Do not read it if you already accept that managing is fragmented and oral — you know the conclusion, and the 1975 article delivers it in an afternoon. Skimmers should read chapters one, two and five and stop.

One thing to try

The shift: stop treating your fragmented day as a problem to fix and start treating it as the actual shape of the work — then decide, on purpose, which fragments are yours to keep.

First move: tonight, split today into the three planes — information, people, action — and put a rough percentage on each. Whichever one is starved is your assignment for tomorrow.

Get the book

Find «Managing» on Amazon — as an Amazon Associate, The Boring Work earns from qualifying purchases (disclosure).

The boring bottom line

Mintzberg won the argument he started in 1973: managerial work is fast, broken into pieces, and done out loud. Half a century of data agrees with him. But «Managing» spends 300 pages proving a point you can grasp in twelve, and then declines to tell you what to do about it. Take the model, skip the volume, and go watch your own week.

Sources

• Mintzberg, H. (1973). The Nature of Managerial Work. Harper and Row.
• Mintzberg, H. (1990, orig. 1975). The Manager’s Job: Folklore and Fact. Harvard Business Review.
• Mintzberg, H. (2009). Managing. Berrett-Koehler.
• Mintzberg, H. (2004). Managers Not MBAs. Berrett-Koehler.
• Porter, M. and Nohria, N. (2018). How CEOs Manage Time. Harvard Business Review.
• Mark, G., Gudith, D. and Klocke, U. (2008). The Cost of Interrupted Work: More Speed and Stress. CHI, ACM.
• de Waal, A. Book review: Managing by Henry Mintzberg. HPO Center.
• The Boring Work. Book Notes hub.

The Russian-language predecessor of this article (2012) is preserved in the archive.