Bonus & Panelty for GR?

Hi,

Here is the scenario...

When MIGO is done there are two factors-one is Delivery and other one is Quality, when delivery is made as per the delivery date within grace period defined then vendor will get some bonus if delivery is late then there will be some panalties for vendor, how to handle it??

second one is quality- if quality is as per defined characterstics then bonus otherwise panelty to vendor....how to map it??