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Shipper measures, without a fake average
On time, lead time, and claims are counts. They are not a score you assign.
On time means the window the shipper wrote down. Lead time is how much notice their process gives. A claim count is claims they opened. An invoice that matched the quote's assumptions is a different count.
Ask which of those they watch. Do not tell them they are below an average you do not have. Do not promise you will beat a fine.
The course that goes further is How to find shippers. Reading this note does not enroll you.