Capture some things, but not everything. It’s a great idea to capture your thoughts, ideas and potential tasks as they come up, but if you can do something in the moment then don’t bother writing it down.
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A big part of GTD is writing everything down. The idea is that you don’t want to rely on your memory and clutter your mind with things you don’t necessarily need to keep in there.
What many people who begin doing this find is that there are other benefits. For instance, you will almost invariably become more self-reflective.