The most common stock count mistakes
Stock counts are conceptually simple, which is why companies tend to underestimate them. In practice, the same handful of errors appears in count after count. Most of them have nothing to do with the counters' skill; they come from weak preparation and weak control.
1. Goods keep moving during the count
If receipts, shipments or transfers continue while people count, the numbers never match. Either stop movements for the duration of the count or control them strictly: keep moved goods separate and record them with a time stamp.
2. Paperwork is late
Documents that are posted after the count make the system and the shelf disagree for reasons that have nothing to do with real losses. Close all open documents before you take the book balance.
3. The same item is counted twice, or not at all
Without clear zones and marking, areas overlap or are skipped. Divide the warehouse into defined zones, mark each counted location and give each team a map.
4. Units of measure get mixed up
Boxes, packs and pieces are confused, or kilograms and grams. State the unit of measure for every item on the count sheet, and train counters to check it.
5. Counters know the expected number
When counters see the book balance, they tend to confirm it. Use blind counting where possible, so that people record what they really see.
6. Differences are corrected immediately in the system
Changing the records right after the count removes the evidence. First recount the differences, investigate their cause, then adjust the records with an approved document.
7. Nobody follows up
The report is written, filed and forgotten. Every significant difference needs an owner and a conclusion: a data error, a process error, damage or a loss.
A simple fix
How to check your own process
After the next count, ask three questions. How many differences disappeared on recount, meaning they were counting errors? How many were caused by documents posted late? How many remained unexplained? The answers tell you which of the mistakes above you are making.
Reduce human error with design
Large differences should always be recounted by a second person. Use scanners where you can, put units of measure on the sheets, and make counted locations visibly different, for example with a coloured tag.
Most of these mistakes disappear with three habits: clear written instructions, marking of counted areas, and an independent recount of any large difference by a different person.