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… - David Allen

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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.