Answer-
1. Folklore-
These are the rules which are not published and is communicated through behaviour and are understood implicitly.
2. Guidelines-
Guidelines are generally published and suggested practices which give some place of discretion with regards to the use and interpretation.
3.Mandates -
They are also published regualtions and orders that are to be followed strictly ,it cannot be ignored in any situation ,as violation of this will lead to punishment.