This is a relationship between two parameters. It means that when one changes, the other will change in the opposite way. So if one goes up, the other goes down. If one goes down, the other goes up.

The opposite influences relationship doesn't cause anything to go up or down all by itself, it just passes along the change. In order to get something to change you need a process and an increases or a decreases link.

The opposite influences link doesn't have to be the only thing going to a parameter. Other influences links or opposite influences links can go to the same parameter. But no parameter can have both an indirect (influences or opposite influences) link and a direct link (increases or decreases) at the same time.

Example, Tanya's achievement level influences her dad's anger in an opposite way. When her achievement is high, his anger is low. When her achievement is low, his anger is high.