TL;DR
Getting Things Done (GTD) by David Allen is the most complete personal productivity system ever written. The full system is too complex for most people to maintain. But the underlying principles — capture everything, clarify next actions, and get things out of your head — are genuinely transformative. Here’s what’s worth keeping and what’s safe to skip.
I have a complicated relationship with Getting Things Done. I’ve tried to implement the full GTD system twice. Both times I maintained it for about three months before the system itself became another thing to manage.
But the parts of GTD that I’ve actually kept — the principles underneath the elaborate methodology — have permanently changed how I work. The system is too much. The ideas are excellent.
The core insight: your brain is for thinking, not storing
Allen’s central argument is that the human brain is terrible at tracking open loops — unresolved tasks, pending commitments, things you need to remember. Every open loop consumes cognitive bandwidth, creates low-level anxiety, and reduces the mental space available for actual thinking.
The solution: capture everything outside your head into a trusted system. Not because you’ll necessarily do everything — but because the act of capture closes the loop psychologically, freeing up mental resources.
This one idea, properly applied, is worth the entire book.
The two-minute rule
If a task takes less than two minutes, do it immediately. Don’t add it to a list. Don’t schedule it. Just do it. The overhead of capturing, tracking, and revisiting a two-minute task costs more than the task itself.
I apply this constantly and it eliminates a significant amount of low-level clutter from my work and personal life.
Next action thinking
The most actionable GTD principle: every item on your to-do list should be a specific, physical, visible next action — not a project or an outcome. “Prepare Q3 brand review” is not a next action. “Open last year’s Q3 review file and identify three key changes” is a next action.
Vague to-do items create procrastination because the brain can’t execute on ambiguity. Specific next actions remove the decision-making step from execution. This principle alone transforms most to-do lists from source of anxiety to source of clarity.
The weekly review
GTD requires a weekly review — a regular pass through all your lists, projects, and commitments to ensure the system is current and trusted. Allen is emphatic: without the weekly review, the system breaks down and your brain stops trusting it.
This is both the most important and most commonly skipped element of GTD. I’ve settled on a lighter version — 20 minutes on Sunday evening — which maintains enough system integrity without requiring the full 90-minute GTD review.
Projects vs next actions
GTD defines a project as any outcome that requires more than one action. Most items on most to-do lists are actually projects, not tasks. Recognising this is important because projects need to be broken down — the to-do list should contain next actions, not projects.
The capture habit
Allen advocates for ubiquitous capture — capturing every idea, task, and commitment the moment it occurs, before it’s lost. The tool doesn’t matter: notebook, phone app, voice memo. What matters is having a single trusted inbox and clearing it regularly.
For people whose work involves creative thinking — which includes most marketing work — this habit is probably the highest-leverage change you can make to your productivity.
What I actually kept from GTD
The full system — with its elaborate folder structures, context lists, tickler files and weekly reviews — is more than most people will maintain. What I’ve kept: capture everything immediately, convert everything to specific next actions, do the two-minute tasks immediately, and review weekly.
That’s roughly 20% of the GTD system and it delivers roughly 80% of the value. The rest is for people who enjoy the system itself as much as the output it produces.
If you’re thinking about how to manage complex project work in teams rather than just individually, my Scrum summary covers the team equivalent of GTD’s individual principles. And the underlying psychology of why these systems work is well explained in the Thinking Fast and Slow summary.
About the author
Prashant Aggarwal is a Brand Manager with 12+ years in consumer goods. He writes about marketing, decision-making and investing at prashantaggarwal.com