I do a lot of to-do lists in my life to keep track of things. Like, we're moving soon, so I have my moving notebook. It's where I'm keeping track of what I need to get done, the progress I've made, information I've gotten, etc. Any phone call I make in regards to the move (like getting info on cat boarding, or rental cars), I'll record it in the notebook.
I have a homeschooling notebook too. I don't necessarily follow it, so much as use it as desired. I jot down ideas in there, and somes will make a to-do list for the week---just stuff I think we ought to get to in the week, or stuff that I think would simpy make for nice ideas. I have a master-list of ideas that I can pull from for my weekly list. But like I said, I don't follow it so much as use it. If we get some downtime, then I'll look to the notebook so see what was going through my head earlier that week. And then I'll see an idea that I like, and think it's a good time for, or I'll see ideas that I've already decided to scrap.