Capture First. Then Process.
Your mind is for having ideas, not holding them.
— David Allen
This is the foundational principle of the first step of David Allen’s Getting Things Done philosophy: capture anything on your mind into a trusted system. Every open loop—such as ideas, tasks, reminders, etc.—must be written down somewhere.
Although this should be done throughout the day, it often takes the form of a brain dump, where everything on your mind is written down all at once. Brain dumps are a great way to clear your mind and can feel productive. The problem is what happens after.
The relief fades. Previous dumps are never revisited. Soon, you feel the need for another brain dump, and the cycle repeats. The same ideas end up scattered across several brain dumps. Nothing actually moves forward.
The mistake is treating capturing and processing as the same thing. They aren’t. The solution is to separate them and make processing unavoidable.
Capturing should be fast and frictionless. No organizing. No structuring. No deciding where something belongs. Just get it out of your head and into a single trusted place. You can use different tools, but everything must ultimately funnel into one source of truth.
Processing is different. It is a dedicated session where you return to that source of truth, decide what matters, and turn what was captured into actions, projects, or notes. These sessions should be regularly scheduled and dedicated only to processing.
Your brain trusts your system only when it sees you returning to it. Every time you capture and then process, you prove to yourself that nothing will fall through the cracks. That is when you can finally stop trying to hold everything in your mind, and brain dumps no longer include ideas already captured. That is when you can focus on getting things done.
Food for Thought
There is a whole subculture out there dedicated to pocket notebooks and their many uses. Peter McKinnon has a great video on how using pocket notebooks for 800 days changed his life. They are a great tool for capture.