Inventory management
Inventory management software tracks stock quantities, values and locations across items, sites and statuses, and records every movement that changes them.
It is part of most ERP products and also sold as a standalone category for smaller manufacturers and distributors.
Key facts
- Stock is held per item, lot, location and status.
- Valuation uses FIFO, average or standard cost.
- Accuracy is maintained by cycle counts and adjustments with reasons.
- Define on-hand, available, reserved, held and in-transit quantities explicitly; their relationship depends on the product’s allocation rules.
- One on-hand figure that mixes them lets sales promise stock production has already allocated.
For example, availability may exclude allocated or held stock, but avoid subtracting overlapping quantities twice. Display the calculation and the stock scope used by the product.
What it covers
| Aspect | In this category |
|---|---|
| Stock | Quantity per item, lot, location and status |
| Movements | Receipts, issues, transfers, adjustments |
| Valuation | FIFO, average or standard cost |
| Accuracy | Cycle counts and adjustments with reasons |
| Reservations | Stock allocated to orders and not yet moved |
Who uses it
| Role | What they need |
|---|---|
| Warehouse and production staff | Record movements and counts quickly and correctly |
| Planners and buyers | See what is available, reserved and arriving |
| Sales | Promise stock that is actually available |
| Accounting | Value stock and explain adjustments |
What makes it hard to design
Several quantities for one item. Available, reserved, on hold and in transit have to be shown as separate quantities.
Every adjustment explained. Every adjustment is recorded with a reason and a user.
History behind every balance. Movement history has to be reachable from any balance.
Units. Units of measure are shown with every quantity.
Cycle counts keep stock accurate without stopping the business. Blind counts hide the expected quantity, because counters tend to confirm the number they see.
Trade-offs
- A strict item model prevents bad data and slows down product introductions.
- Showing every status as its own figure is precise, though stock screens get busier. One combined figure reads faster and hides the stock that cannot actually be promised.
Common mistakes
- One on-hand figure that mixes available, reserved and quarantined stock. Sales promises stock that production has already allocated.
- Adjustments without a reason
- Balances with no path to their movements
- Counting screens that show the expected quantity
Related experience