Ask what each record was made to record. Production totals can answer questions about output, while wage books or interviews may address different questions. A missing record is a gap, not proof of a particular story.
Worked example
A factory account that lists 500 finished baskets can support an output claim. It does not, by itself, show whether the workers were comfortable or how long they worked.
A Fictional Workshop Archive
A workshop's production ledger lists 400 baskets in April 1924 and 500 in May 1924. An inspector's note dated May 8 says, 'During my morning visit, two windows were open.' The May wage book is missing. All records in this exercise are invented. No work-hours register or worker interviews have been provided.