You’ve heard of deep work and want to know whether deep work is legit or just a trend. Or you tried it, and it didn’t work for you.
This article separates what is real from what is argued. It shows what the studies measured, how to judge a block, and why deep work fails for some people. Then you get a test to run yourself.
Is deep work real?
Yes, deep work is real as a way of working. You can sit down today and do it. Cal Newport, author of Deep Work, calls it professional work in distraction-free concentration that pushes your mind to its limit.
That’s what deep work is, in short. Newport also makes a bigger claim.
“The ability to perform deep work is becoming increasingly rare at exactly the same time it is becoming increasingly valuable in our economy.”
Cal Newport, Deep Work
In my view, that sentence is an argument about the economy. It is not a measurement. It’s known as the deep work hypothesis, and you don’t have to accept it to try the practice.
So the question has two parts. Part one: the practice is real. Part two: does it bring you better results?
That part is still open. The rest of this article is about it.
Is deep work academically sound?
Partly yes. Some reasons behind deep work rest on studies, and some rest on argument. The studies look at what task switches and interruptions cost, and how many hours of hard practice people manage.
Two parts rest on argument, and one is the rare-and-valuable claim above. The other is the method itself: protected blocks instead of a normal, broken-up day. A block is a timed stretch of focused work on one goal.
None of the studies below compares these two kinds of day. That gap is where the limits of the deep work idea start. So when you look for research on deep work, check what each study measured.
My own book isn’t research either. I wrote it as a tool and not as a theory book. What you read in it is what I use every day.
How can you tell if deep work works?
A tool is judged by what it produces. With deep work, you compare what a block produced with the result you wanted.
A strong feeling can fool you. Coffee shows how easily that happens.
Judge a block the way you would judge coffee: compare the actual work output and not the feeling. Your measure is the block goal, the result you want from one block. You write it on your protocol sheet, a plain sheet of paper for your goal and work steps.
Without a goal, you just work. With a goal, you work toward a result. To apply this to a whole week, read about whether to track hours or milestones.
What do scientific studies on the impact of uninterrupted work show?
As for the research, scientific studies on the impact of uninterrupted work show that switches and interruptions have costs. But the costs are not always what you would expect. Here are four studies, and what each one measured.
| Study | What it looked at | What it found |
|---|---|---|
| Leroy (2009) | Two experiments on switching away from an unfinished task | Attention stays on the old task; people do worse on the next |
| Mark, Gudith and Klocke (2008) | An email task with interruptions, 48 people | Done faster, same quality, but more stress |
| Gloria Mark, Gallup interview (2006) | 36 workers shadowed at their jobs | Interrupted work resumed after 23 minutes 15 seconds on average |
| Ericsson, Krampe and Tesch-Römer (1993) | Practice diaries of violin students | The two best groups practiced alone 3.5 hours a day |
In the email study, interrupted people finished faster, with no difference in quality. The price was more stress, frustration, time pressure and effort. It was a simulated email task in a lab, and it didn’t test planned blocks of focused work.
The 23 minutes are the time until people went back to interrupted work on the same day. That was 81.9 percent of cases, with about two other tasks in between. The figure doesn’t show when focus returns, which is part of what task switching costs.
The violin figures come from music practice, and the authors found about four hours for expert pianists too. They only say that a more general limit might exist. For more, read about the evidence for the 4-hour limit.
Why deep work doesn’t work for some people
Outside the lab, if deep work doesn’t work for you, check your block before you drop the idea. Four things can break a block. A fifth comes before the block starts.
Deeper causes are in why you struggle with deep work.
- Your phone is in sight: it’s built to capture your attention. Turn it off and put it in another room.
- Your block goal is too big: too big means overwhelm, and overwhelm means paralysis. Make it ambitious but doable.
- Your schedule is too rigid: blocks don’t have to start exactly at 9:00 or 10:00. Some like a fixed schedule, others feel pressured by it.
- You expect perfect blocks: at first you’ll forget steps and get distracted anyway. That’s normal, and it gets better with every block.
The one before the block is your state: how rested and awake you are. Working tired can be worse than not working at all. You make mistakes and produce work you must redo.
If you’re not quite fit, get your body moving first. If you’re massively tired, take a power nap of 10 to 20 minutes or postpone the block.
Do deep work blocks help, or are they just another productivity myth?
Once you’re rested, deep work blocks help if they leave a result you can see. You don’t need a study to check that. A few blocks of your own are enough.
The test below takes a few steps from my book. For the full sequence, read about how to do deep work.
- Pick one task that needs your full attention.
- Set a timer, so the block has a clear end.
- Write the block goal as a finished state, for example “First draft of the outline is done.”
- Work until the timer rings, and keep going if you’re fully absorbed in flow.
- Check the result against your block goal: reached, partly or not at all.
Do a few blocks like this, then look at your protocol sheet at the end of the day. A missed block goal tells you what to change in the next block. Over time, you learn what you can realistically get done in a block.
In my view, if your sheet shows finished results you didn’t get before, deep work works for you.
So run the test with blocks you set up well. Then your sheet shows whether three focused blocks get more done than eight hours of half-concentrated work. See how it works →
FAQ
Can you overdo deep work?
Yes, deep work without real breaks burns you out, and the blocks that follow get worse. When the quality of your blocks drops, end the workday, even if it’s only been three hours. One sign is that getting into the work takes longer and longer.
Is deep work the same as working long hours?
No, deep work means distraction-free concentration on demanding work, and hours at your desk are not the measure. My book sets three focused 45-minute blocks a day above eight hours of half-concentrated work.
Does deep work ignore how you feel?
No. In deep work, how you feel decides how long each block of focused work lasts. On a strongly unmotivated day, a 15-minute block still gets you started, and that’s better than nothing. When you’re awake and focused, 45 minutes is ideal.
