I've held several jobs which required me to keep an Engineer's Notebook. It was the place were I jotted down all my ideas, thoughts and random pieces of info I

I've held several jobs which required me to keep an Engineer's Notebook. It was the place were I jotted down all my ideas, thoughts and random pieces of info I needed or found useful. It served 2 purposes: 1. I could go back in time and jump directly to the solution of something that I knew I had solved but couldn't remember how. 2. It was used by my employers to save in case a patent case arose and they had to find evidence pointing to engineers working on a particular idea. For that reason, the notebook had to have sequential numbered pages, entries had to be dated and binding had to be sewn (to decrease the likelyhood of tampering).