Why Keeping Projects on One Flat List Is the Most Underrated Rule in GTD®

Somewhere around 2011 I spent an entire Saturday building the perfect project hierarchy.

Folders inside folders. A "Business" area with sub-areas for marketing, operations, and product. Color codes. Tags that cross-referenced the folders. By dinner I had a structure worthy of a Fortune 500 org chart, and I felt fantastic about it.

Within three weeks I couldn't tell you what was in it. Not because the structure was wrong, but because the structure was the point, and the work wasn't. I'd built a beautiful place for tasks to go and die.

David Allen saw this coming decades ago. In Getting Things Done®, the projects list is flat. One list. Every open commitment that takes more than one action, sitting side by side: "Rebuild the deck," "Hire a bookkeeper," "Plan Mom's 90th." No nesting. No areas-of-areas. Just the honest, slightly uncomfortable truth of everything you've said yes to.

People fight this rule more than any other in the book. Here's why it's right and they're wrong.

A hierarchy answers the wrong question

A nested structure answers "where does this belong?" That's a librarian's question. The question that actually matters on a Tuesday afternoon is "what do I have going, and is any of it stuck?"

A flat list answers that in one glance. Scroll it top to bottom and you've just reviewed your entire life. Thirty seconds. Try doing that with folders. You can't, and that's the trap. Whatever's collapsed inside a folder is invisible, and invisible commitments don't get done. They rot quietly until they become emergencies.

The flat list is a forcing function

Here's the part nobody tells you: the discomfort of the flat list is the feature.

When every project sits on one list, you can't hide from the count. If there are 73 projects on it, you have 73 open commitments, and you feel it. That feeling is information. It's what makes you finally admit that "Learn Italian" has been sitting there since 2023 and either belongs on Someday/Maybe or in the trash.

Folders launder that discomfort. They make 73 commitments look like 6 tidy areas. You feel organized while being wildly overcommitted. It's the productivity equivalent of paying the minimum on a credit card.

The only question a project has to answer

A project on your list earns its place by answering one question: what's the next action?

That's it. Not "what's the plan," not "what phase are we in." Just: what's the very next physical thing that moves this forward? A project with a next action is alive. A project without one is stalled, by definition, and stalled projects are where systems go to die. You stop trusting the list because you know it's full of corpses.

When I do my weekly review, that's the whole job: walk the flat list, and make sure every single project has a live next action. Takes a few minutes. Saves the whole system.

(This is, frankly, why we built SmartyTask's weekly review to literally show you which projects have no next action. It's the one piece of automation that rule deserves. The app keeps the projects list flat too. You can't build the filing cabinet, on purpose. People occasionally email asking for nested folders. The answer is a polite no, with a link to this post.)

"But I have too many projects for one list"

No. You have too many projects, period. The list didn't create that problem; it revealed it. Anything you're not committed to moving forward this season goes to Someday/Maybe, where it can wait honestly instead of haunting a folder.

A working flat list for most busy people runs 30 to 100 projects. That sounds like a lot until you actually write down everything you've committed to. The list isn't long because the method is bad. The list is long because your life is long. At least now you can see it.

Try it this week

Take whatever system you've got (app, notebook, the back of your mind) and flatten it. Write every open multi-step commitment on one list. Then walk the list once and give every item a next action or a ticket to Someday/Maybe.

Most people who do this discover two or three projects they'd completely forgotten, usually ones with another human waiting on them. That alone pays for the exercise.