Too general; which rules are you referring too?
1) Entry rules
2) Exit rules
3) Money managment rules
4) Scheduled news reports/earnings/speeches/etc) rules
5) Event (terrorism/earthquakes/assassinations/etc) rules
6) Personal state-of-mind (hangover/sickness/death of family member/etc) rules
For me, state-of-mind, money management, and news rules are ALWAYS. Entry and event rules are MOST OF THE TIME. Exit rules are SOMETIMES.
Happy Holidays.