Use the hierarchical system I. Roman literals for big topics 1. Arabic for lesser subjects A. For extra clarification - for notes You can expand it further, but these are usually enough. Got this one in university back when nobody had a computer with them. It really helps structure the material and get back to it later. Seems a bit too intuitive now with all the auto-formatting but still really helpful.
I've had so many battles with roman numerals making other numbering systems confusing/redundant that the only place I ever want them are on fancy watches.
Even for that they are beaten by 24hr digital, but thats not quite as stylish.