I am reminded of the “filling the jar” story made famous by Stephen Covey. First the jar is filled with big rocks, until it seems full. But there is still room for small pebbles.After that, sand and finally water. The point of the story is not that you can always squeeze a little more in, but rather that you have to put the big rocks in first or you will never get them in. Covey is a bit vague on what constitutes a big rock, just like David Allen says “trust your gut” in choosing next actions in the moment. Personally, I find it useful to distinguish between three categories of next actions. First comes next actions which are important now, usually associated with important projects. Big rocks, perhaps. Next comes single next actions not associated with projects which are essential to keeping my life running smooohly. Most of them are recurring, like the weekly review or grocery shopping. These are perhaps water, necessary for life. Then there’s everything else, the in-between stuff. Big rocks tend to have a large upside, while the downside of not doing essential next actions is often large. I don’t think there is one right way to conceptualize the issue.