[gary]

thanks for the reply - I see I've got a long way to go to get my head around all of this.

A big problem is that omnifocus is being used by users that believe in strict gtd structure, loose gtd structure, and some with no gtd background. For instance, it kills me that my singleton bucket is under projects. It's not a project. It's a group of single actions unrelated. For others, it's not a big deal. And this:

I think that singletons are actually actions of undefined or undelineated projects. While "water plants in kitchen" can't usefully (or sensibly) be broken down into smaller actions, it is part of a larger project, which could be "Keep Houseplants Alive"

Makes my brain hurt. In my mind it's not a project if it can't be completed. Fixing up an old car is a project. Keeping it running is an area of responsibility. But, obviously, for others this works.