For one of my wargaming projects, I started keeping track of things in a handy Mini Composition Book. I think you used to be able to buy these 10 for $1 USD at the dollar store. Then they were 3 for $1.25 USD, and now they seem to be extinct.
But my project grew, and soon I had a dozen different notepads – and I couldn't find the same notebooks, so I had four different type of mini-notebooks. They didn't stack well, and kept falling over each other.
So one day I suddenly realized: Bill, you're a computer guy from way back, just put the info in a spreadsheet! 
So I did. Not as satisfying as writing things by hand in those notebooks, but much more practical!