You can obtain information such as the following from the vendor evaluation data:

Vendor Miller Corp. supplies goods of very good quality at fair prices, but occasionally fails to adhere to agreed delivery dates. However, this vendor's scores for on-time delivery performance have considerably improved over the last three months.

Vendors are evaluated at purchasing organization level. This means that each purchasing organization evaluates the vendors that have been assigned to it. For this reason, you can only compare vendors that have been assigned to the same purchasing organization. It is only possible to carry out a comparison across purchasing organizations if the vendor evaluation criteria and rating scales in the various purchasing organizations are identical.