When using a record set with which you are not familiar, think about how someone gets into the record, how the information in the record is obtained, how the record is organized, what was the purpose of the original record, and how the original record got from its original state to you.
If possible compare the record of interest to others in the same series of records. How is it the same? How is it different?
All if these issues get to how we use and analyze the information contained in the record.