Hi
Are these related?
why are these related?

Hi
Are these related?
why are these related?

You need to be more specific on what you are asking for.

Is there an attachment that you have?

What type of business?

These are just some of the questions that need to be answered if you are looking for assistance.

Hi
Are these related?
why are these related?

On the chance that you're referring to the AIAG FMEA form, the "class" column is usually used for critical characteristics symbols, such as GM's diamond. Here's what the AIAG FMEA manual says:
This column may be used to classify anu special product or process characteristics (e.g., critical, key, major, significant) for components, subsystems or systems that may require additional process controls.

This column may also be used to highlight high priority failure modes for engineering assessment...

Special Product or Process Characteristic symbols and their usage is directed by specific company policy and is not standardized in this document.

How classification methods and symbols relate to the "Severity" RPN factor is a matter of logical progression; if a given item has a high severity rating, the chances are good that it should be highlighted, one way or another, in the "Class" column, but that might not always be the case.

In the Ford methodology the relation is as follows :

Severity 9 or 10 = always Class = Critical ( safety item )

Severity between 5 and 8 combined with a occurence higher than 4 = significant characteristic

Hope this helps,

Antoine