Nothing fancy, just a three ring binder with sections for parts used, and the part numbers. Measurements of various items that I've made, might have to make another someday, this should be easier if it gets pranged. Pictures of the project as it goes along, and pictures of other peoples projects like mine. Might want to "incorporate" some ideas! A place to jot down ideas and drawings so I don't forget what the day dream was at the time.....three months down the road. More or less a paper memory of what's happening with the project.