Lots of additional reading
This is an excellent question and one that I'm often thinking about and exploring.
I listened to Wild Success in 2013 webinar, during which I heard DA mention a book that deeply influenced his views on visioning called Release Your Brakes! I found a used copy and have been digging into it.
I also listen to as much GTD Connect audio as possible - from these I've found many interesting and useful resources or new ways of thinking about something. Have you listened to the recent interview DA did with Dan Pink? I must have written a full page of notes from that.
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