[mparfitt]

I'm not sure I have the perfect answer to this question, but my sense is that the weekly review needs to include an assessment of "how much is too much." That is, GTD makes it possible to get pretty ambitious about how much we can handle, how many balls we can juggle at one time, how many different things we can fit into our day. But we shouldn't get carried away, and allow ourselves to take on more than is mentally or physically healthy. So the weekly review -- or at the minimum the monthly review -- should include the question, "how did this last week feel?" and "how do I want the next week to feel?" Did I include enough "down time," "me time," "family time" (or whatever) in the week? Can I do less and still fulfill all my real obligations? I suspect most of us need to come up for air at least once a day, and allocate more free, unassigned time into our weeks ... for the unexpected, for a nap, for a walk around the block to clear the head.