If one lot went wrong today, how long to find every batch it touched?

One raw material lot turns out to be a problem. You need every batch that used it, and every customer and distributor those batches reached.

Regulators expect that answer in hours. Most plants would need days, because the chain lives across a store register, a production sheet and a dispatch book.

Lot attaches at charging, batch attaches at dispatch. Forward and backward trace is one query.

Input weight and output weight are both known. They are rarely compared per batch, at the time.

So a line that has drifted, or a setting that is quietly wrong, is absorbed into a monthly figure that looks close enough to last year.

Charge and output are recorded per batch, so a persistent gap has a line and a shift attached to it.

Cleaning and sanitation happen. The record of them is a register, signed at the end of a shift, often for several things at once.

When an auditor asks to see the record for a specific line on a specific date, the honest answer is a search — and a signature written in one go tells the auditor exactly that.

Each cleaning is recorded when it is done, by the person who did it, against the line.