This page allows you to define your impact level .Through this page you can :
Edit Impact Levels
Clicking on the icon next to an impact level allows you to edit it .

Delete Impact Level
An impact level can be deleted by clicking on the next to it .

Add Impact Level
You can add a new impact level by clicking on +Add New Impact Level icon at the bottom of the page.

Reorder Impacts
Impacts can be reorder simply by dragging and dropping the impacts .