I've solved this in several ways that depend on the need. 1. Multiple small notebooks. I love ~50pg, 5"x7" lined notebooks. They're cheap, and portable. Just g

I've solved this in several ways that depend on the need. 1. Multiple small notebooks. I love ~50pg, 5"x7" lined notebooks. They're cheap, and portable. Just get one for each project. 2. I usually allow myself 1-2 extra pages for longer thoughts or things that will require follow-up. That almost always works. 3. Indexes. Set aside 20pgs at the front (or back) for a table of contents. I do this with my longer notebooks (~200pgs) and I never have trouble finding things. If you need to continue a section later on call it "Project X (cont.)" I feel like #3 is something that generations before us knew implicitly that we've forgotten. [edit: grammar] [Edit: Addendum] Also, always date your entries. That helps a lot.