1) Having an engineering notepad can help you if you are ever called upon to answer legal questions regarding your project.2) An engineering notepad can help you if you need to quickly retrieve information in the event of a patent dispute.3) If you were to suffer an untimely death, an engineering notepad can help preserve your work.4) An engineering notepad lets you keep notes that aren't suitable to include in the schematics.5) Keeping an engineering notepad helps to keep your ideas and thoughts organized.