Sharepoint document libary, training registration and skill matirx

Hi,

I have a document library such as below filled with instructions and work procedures.

I need a way to register the training of many operators for each document.

A list, a skills matrix or something like that where each person is graded per document, i.e. 0 (not trained) to 5 (able to train others).

The people who need to be trained do not have accounts, so a sort of sign off via email is not possible.

Any who has an idea how to do this?

Thanks. 

Kind regards,

Marthijs