Return on Investment Factor (ROIF)
The Return on Investment Factor (ROIF) how measures how much value you gain by having a Requirement weighted against the complexity (User Story Points) of implementing it.
In the default installation, the ROIF is calculated as Business Value divided by the sum of the mandatory User Story Points. Of course you can change the calculation criteria of this property to include all User Stories (not just the mandatory ones).
A high ROIF value basically means that either it is a really valuable feature or something is really easy to implement.