Counting while operations continue: setting a cut-off time

"We cannot stop production." That is the sentence heard most often in factories, yet a count needs an exact moment in time. The difficulty is that counting takes hours or even days, goods keep moving in and out, and the books change every minute. For a count result to mean anything, one question must be answered first: which moment's book stock does the counted quantity belong to?

Why you need a point in time

Book stock is a number at one moment, and physical stock is a number at one moment. If you compare what was counted on Wednesday morning with the books of Tuesday evening, every receipt and issue in between turns into a "difference". It looks like a shortage or a surplus but is only a time gap. The cut-off exists to make books and goods point to the same moment.

There are two ways to achieve it: freeze some areas for a while, or let goods keep moving but record every movement and calculate afterwards.

Method one: freeze by zone

Divide the warehouse into zones and count one at a time. Before counting, the zone stops receiving and issuing, and the start and end of the freeze are written down. Goods needed in the meantime are taken from another zone, or handled in a staging area outside the count. A zone's cut-off is the moment it was frozen. Mark a frozen zone with tape or a sign that states when it will reopen.

This suits warehouses with clear zones, moderate movement and a staging area, and also high-value items that must be exact. The drawback is that production and sales must be coordinated in advance, and an urgent need during the freeze requires a named approver.

Method two: roll back with a movement log

There is no freeze. Goods move as usual, but every movement during counting is logged with the document number, item, quantity and time. After counting, bring the count to the cut-off with these relations:

• Counted after the cut-off: stock at cut-off = counted quantity + issues since the cut-off − receipts since the cut-off.
• Counted before the cut-off: stock at cut-off = counted quantity + receipts after the count − issues after the count.

An invented example: the cut-off is the end of day one. At 10:00 on day two, 480 pieces of an item are counted. Between the end of day one and 10:00 on day two, 60 were received and 100 issued. Stock at cut-off = 480 − 60 + 100 = 520 pieces. Book stock at the cut-off is also 520, so there is no difference.

This only works if the movement records are complete, timed and not written up afterwards. Keep the roll-back calculation on an attached sheet so that a reviewer can redo it step by step. Pre-number all documents, put a "movements during count" sheet at the door and have the storekeeper fill it in at the moment of each receipt or dispatch.

Choosing and combining

• High-value items in separate areas: freeze.
• Fast-moving items that cannot be interrupted: movement log.
• Line-side stock and work in progress: count at a natural pause such as a shift change or lunch break, and have production confirm the work-in-progress quantity at that time.
• When both methods are mixed, mark on the count sheet which one applies to each zone, and reconcile them separately.

Whichever you use, tell head office and the local accountant before you start what the cut-off is and how movements in the meantime will be handled.

Common traps

• Documents entered late: goods leave on site but the paper is raised the next day, and the roll-back misses it.
• Documents back-dated to before the cut-off: a document raised afterwards must carry the date and time when the movement really happened.
• Counting and roll-back in different units of measure.
• The same goods counted in two zones, or in neither.

In short

A count while operations continue depends on a clear moment in time and a complete movement log. UzWarehouse's services include counts without stopping operations. Before we start, we agree the cut-off and the basis with you, and then reconcile the result line by line with your books.