The Manage Grade option lets you define ranges so that if the overall score (average/manual overall rating) falls under one of these ranges, the application will show the short-code and verbal definition of range that is set instead of the actual score.

For Example:

If you have set the following ranges/grades in your cycle settings,

And the employee received 3.3 as the score then the overall score (average/manual overall rating) will be verified against the available ranges and application will display 'C - Meets Some Expectation' on the review page and also on the Org/Team Dashboard. 

**However, the actual calculation is only visible to the HR Manager/Admins when they open the review page from Org dashboard but remains hidden to the Employee and the Manager always.

This feature is really helpful in case of Verbal Rating where we truncate the decimal part to draw the overall rating.