I became Type A in response to painful situations that I created. I was a complete disaster until I was 24, and got a job I liked that demanded that I was good at details. Without all my little systems, I am still the 23 year old.
Bingo. If I don't write things down, they're gone. If it's not in the calendar, it doesn't happen. If it's not explicit in the project plan, it's not real. Everyone says, "wow you're so anal." And I'm like, "no, I'm an actual moron."
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I also am a big fan of GTD
"What are you talking about, it IS Thursday!"