Seems to me that this is what the GTD Weekly Review is all about - you take stock of your world once a week, decide what is important and then spend the rest of

Seems to me that this is what the GTD Weekly Review is all about - you take stock of your world once a week, decide what is important and then spend the rest of the week executing those decisions - you are not allowed to second-guess yourself because GTD is all about having "integrity in the moment of choice" regarding your decisions.