In the book GTD I noticed a brief section on Checklists, which I understand to be a "fuzzy" category. I use them for almost anything in the GTD system. For a mini project, I might make a separate Project list for this Mini Project (similar to the way one might make a separate Next Action list as an "agenda" for a meeting or a person you'll see, or a NA list of NAs you'll do when there's a phone available, or a computer, etc.) This one would be for when I'm working on the Mini Project, and would have sub-items showing what I need to do to reach the goal. I'd put as many as needed onto a NA list, and review this Projects List as often as needed. If the project is also a recurrent one, that hibernates for a long time, I'd move it to Someday/Maybe, perhaps in a Recurrent section; if it had Project Support material, I'd move those to General Reference filing; all this is simple, a small price for keeping the currently "active" things separate and unclouded by nonactionable stuff.