The short-term-memory part of your mind—the part that tends to hold all of the incomplete, undecided, and unorganized “stuff”—functions much like RAM on a personal computer. Your conscious mind, like the computer screen, is a focusing tool, not a storage place. You can think about only two or three things at once. But the incomplete items are still being stored in the short-term-memory space. And as with RAM, there’s limited capacity; there’s only so much “stuff” you can store in there and still have that part of your brain function at a high level. Most people walk around with their RAM bursting at the seams. They’re constantly distracted, their focus disturbed by their own internal mental overload.
American productivity consultant and author
David Allen (born December 28, 1945) is an American productivity consultant, best known for the creation of a time management method called "Getting Things Done".
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That means as soon as you tell yourself that you might need to do something, and store it only in your head, there’s a part of you that thinks you should be doing that something all the time. Everything you’ve told yourself you ought to do, it thinks you should be doing right now. Frankly, as soon as you have two things to do stored only in your mind, you’ve generated personal failure, because you can’t do them both at the same time. This produces a pervasive stress factor whose source can’t be pinpointed.