What are "tools?"
Tools are skills and strategies taught in order to appropriately handle a situation.
When you say "system," what are you talking about?
Your "system" is the family unit that you and each member of your family (1 or more) interact within.
Looking at a system is a more holistic approach to looking at how things function together, rather than only looking at one person and how they are functioning.
The word "systems," stems from "Systems Theory," which says that individuals cannot be understood in isolation from one another, but rather as a part of their family, as the family is an emotional unit.