David Allen's Getting Things Done methodology starts with a deceptively simple instruction: capture everything. Every task, idea, commitment, "I should really..." thought, half-formed plan, and nagging worry — get it out of your head and into a trusted system.
Most people skip this step or do it halfway. That's why most people's GTD implementations fail.
Your brain is excellent at having ideas. It's terrible at holding them. Cognitive psychologists call this the "Zeigarnik effect" — unfinished tasks occupy mental bandwidth, creating a low-level anxiety that persists until the task is either completed or captured in a system you trust.
The key phrase is "system you trust." Writing something on a random sticky note doesn't count because you don't trust that you'll see it again. Your brain knows this, so it keeps reminding you. But when you capture a task in Toodledo — a system you check daily — your brain can let go. It trusts the system to remind you at the right time.
This isn't metaphorical. Research on prospective memory shows that external reminders free up cognitive resources. People who offload "remember to do X" tasks to reliable external systems perform better on current tasks because they're not spending mental cycles on maintenance.
Everything. That's not an exaggeration. The GTD capture practice includes:
Tasks. Anything you've committed to doing, no matter how small. "Buy birthday card for Mom" is a task. So is "Restructure the engineering team."
Ideas. That blog post idea you had in the shower. The product feature that occurred to you during a meeting. The vacation destination someone mentioned. Capture it now; evaluate it later.
Commitments. Anything you've told someone you'd do. "I'll send you that article" is a commitment. "Let's grab coffee sometime" is a commitment (or it should be — if you don't intend to follow through, don't say it).
Waiting-for items. Things you've delegated or are expecting from others. "Waiting for John to send revised proposal" keeps you from wondering whether you've followed up.
"Someday/maybe" items. Things you might want to do but haven't committed to. Learn Spanish. Visit Portugal. Read that book about behavioral economics. These go on a separate list, reviewed periodically.
The hardest part of capture isn't understanding it — it's making it automatic. Here's how to build the habit:
Minimize friction. The faster you can capture, the more you'll do it. Toodledo's mobile app should be on your phone's home screen. Use the quick-add feature. Don't worry about priority, context, or due dates during capture — just get the item recorded. You'll organize it later during your processing phase.
Capture triggers. Train yourself to recognize capture moments: when someone asks you to do something, when you think "I should..." or "I need to...", when an idea strikes during a conversation, when you notice something that needs fixing. Each of these is a capture trigger.
The mind sweep. Once a week (ideally during your GTD weekly review), do a complete mind sweep. Sit with Toodledo open and ask yourself: "What's on my mind? What have I committed to? What am I worried about? What am I avoiding?" Capture everything that surfaces. This catches the items that slipped through during the week.
Multiple inboxes, one system. You might capture via your phone, your computer, a notebook, or even voice memos. That's fine — but all captured items must flow into one system. If you use a paper notebook for quick capture, schedule time to transfer those items into Toodledo daily. Two parallel systems means things fall through the cracks.
Capture without processing is just a longer to-do list. Once items are captured, they need to be processed — and this is a separate activity.
Processing means looking at each captured item and deciding: Is this actionable? If yes, what's the next physical action? If no, is it reference material, a someday/maybe item, or trash?
In Toodledo, processing looks like going through your inbox (unsorted tasks), adding context, priority, due dates, and folders. A captured item like "Website stuff" becomes "Review and approve new homepage design — @Computer, High priority, Due Friday, Folder: Marketing."
Capturing too vaguely. "Handle the thing with accounting" won't mean anything next week. Capture enough detail that future-you understands what present-you meant. Two extra seconds now saves two minutes of confusion later.
Capturing and organizing simultaneously. When an idea strikes, just capture it. Don't stop to assign folders, priorities, and contexts. That interrupts whatever you're currently doing. Capture is fast and messy. Processing is deliberate and organized. They're separate activities.
Not trusting the system. If you capture things but never look at your task list, your brain won't let go. The capture habit only works when paired with regular review. Check Toodledo at least once a day, and do a full weekly review. Your brain needs to know the system works before it'll stop nagging you.
When capture becomes automatic, something shifts. You stop carrying the mental weight of hundreds of open loops. Your mind quiets down. You can focus on the task in front of you because you trust that everything else is safely recorded and will surface at the right time.
David Allen describes this as "mind like water" — a state of relaxed readiness where your attention goes to what matters right now, not what you're afraid you'll forget. It sounds idealistic, but it's not. It's just what happens when you stop using your brain as a filing cabinet and start using it for what it's actually good at: thinking.