Why GTD works
Getting Things Done was published in 2001, before smartphones, before every app on your phone shipped with a to-do list inside it. By rights it should be out of date. It isn’t, because the book describes a workaround for a few stubborn facts about how attention and memory behave, and those haven’t changed since.
Four mechanisms doing the work.
Strip the method back and the same four ideas sit under almost every rule in the book. Each one is aimed at something your mind does badly, not at a personality flaw. Everyone has these limits, including the people who look organized.
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1 · Open loops nag
Anything you’ve started and not finished keeps surfacing — in the shower, at 2 a.m., in the middle of a meeting. That reminder isn’t useful, because it never arrives when you could act on it. Capturing gives the loop somewhere else to sit.
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2 · Working memory is small
The number of things you can genuinely juggle at once is roughly four, not forty. When your commitments live in your head, you drop most of them and pick them up again, over and over, which is where the low hum of overload comes from.
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3 · Thinking works better on paper
A list does more than record thinking you already did. Once ideas are outside your head, side by side, you can compare, sort and spot the gaps — work that’s slow and unreliable when everything is held in mind at once.
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4 · Only a trusted list quiets down
Writing something somewhere doesn’t help if you half-suspect the list is out of date. The mind keeps its own copy as insurance. Reviewing regularly is what earns the list enough credibility to let go.
Unfinished things keep knocking.
In 1927 Bluma Zeigarnik reported that waiters recalled unpaid orders better than settled ones, and that interrupted tasks were remembered more readily than completed ones. The name stuck: the Zeigarnik effect. Later attempts to reproduce it have been uneven, and the memory advantage is smaller and less dependable than the popular version suggests.
The part you can feel for yourself survives the caveats. An unfinished commitment stays live in a way a finished one doesn’t, and it resurfaces on its own schedule rather than yours. GTD’s first habit is to give every one of those a landing place outside your head. More on the Zeigarnik effect and what it does and doesn’t show →
You can hold about four things at once.
The famous number is seven, from a 1956 paper by George Miller. The number most researchers now work with is smaller: Nelson Cowan’s 2001 review put the practical limit at around four chunks of information (Cowan, Behavioral and Brain Sciences, 2001). Four items, not four projects.
You were never holding a mental to-do list of thirty commitments. You were cycling it: a handful in view, the rest rotating in and out, each rotation costing attention you wanted for the actual work. That cost is why GTD is so insistent about getting things out of your head before deciding anything about them. More on cognitive overload and the limits of working memory →
Thinking with things outside your head.
There’s a stronger claim here than “write things down so you don’t forget”. In The Extended Mind, philosophers Andy Clark and David Chalmers argued that a notebook you consult reliably is doing the same job as biological memory — that the thinking isn’t happening only behind your eyes (Clark & Chalmers, Analysis, 1998).
You don’t have to buy the philosophy to use the practice. Lists, contexts and project outlines all do part of the thinking on the page, where it stays put. It is also why GTD asks for one concrete next action rather than a vague heading: a step you can act on later without reloading the whole situation into memory first. More on distributed cognition and thinking outside your head →
The review is what makes it believable.
Masicampo and Baumeister found that unfulfilled goals produced intrusive thoughts and interfered with unrelated tasks — and that having people write a specific plan for the goal largely removed the interference, without the goal being any closer to done (Masicampo & Baumeister, Journal of Personality and Social Psychology, 2011). The plan, not the completion, is what let them put it down.
That result is about plan making, and GTD extends it with a claim of its own: a plan only works while you still believe it. A list you haven’t looked at in three weeks is a guess, and some part of you knows it, so you start keeping a mental backup copy again. The weekly review is the unglamorous maintenance that keeps the rest honest, and the habit people drop first, which is usually why the system stopped feeling calm.
None of this requires an app.
A notebook satisfies all four mechanisms. What software can do is lower the cost of the habits: capture on whatever device is in your hand, a next-action list that filters itself by context, and a guided weekly review that walks the whole system so the hardest habit is the one with the least friction.
That is the job Mindwtr was built for. Full GTD out of the box — inbox, next actions, waiting-for, someday, areas, contexts, sequential projects — completely free and open source under AGPL-3.0, no account, offline by default, everything in a local SQLite file on your own machine.
Keep reading.
New to the method? Start with the five habits — plain language, about five minutes. For the bigger picture above your task list, read the horizons of focus. If you’ve tried GTD before and bounced off, GTD with ADHD covers what to change. The Mindwtr handbook puts the whole workflow in one place.