What Is an Inventory Management System? A Guide to Better Stock Control

In brief: An inventory management system is software that shows, in real time, where each product is and how many are available, while recording every stock movement. A good system supports accurate barcode/QR entry, alerts you when stock reaches a critical level, calculates reorder points to prevent both stockouts and overstocking, tracks lots and expiration dates for traceability, and integrates with ERP, accounting and e-commerce systems. The measure of a successful system is simple: the recorded quantity matches what is on the shelf.

Last updated: September 2026

Common inventory management problems

• Records don't match the shelf: The system shows 10 units but only 6 are on the shelf, leaving nothing for a promised customer.
• Stockouts: A fast-moving item runs out and the sale is lost.
• Excess stock: Slow-moving inventory ties up cash, becomes obsolete or expires.
• Time lost: Operations stop during stocktakes, and discrepancies take days to investigate.
• Poor traceability: You don't know where a lot went, making a recall difficult.
• Inconsistent channels: Stores, warehouses and e-commerce show different quantities.

What a modern inventory system should include

1. Barcodes and QR codes

Manual entry is a major source of typing errors. Scanning a barcode improves both speed and accuracy. The global product identification standard is GS1. Retail products commonly use the GTIN-13 (EAN-13) barcode; GS1 numbers issued in Türkiye start with 868/869 (GS1 Türkiye). GS1 barcodes are generally not mandatory for domestic sales in Türkiye, but are often required by international marketplaces and large retail chains. For internal use—raw materials, semi-finished goods and cartons—you can create your own codes. 2D barcodes and QR codes can carry more information, such as a lot number or expiration date.

2. RFID

Unlike barcodes, RFID tags can read multiple items at once without a direct line of sight. They work well for rapid stock counts and tracking high-value items. They aren't right for every business: performance can drop around metal and liquids, and tags cost more than barcodes. Test the need and cost before investing.

3. Lots, serial numbers and expiration dates

Tracking by lot or serial number provides traceability in industries such as food, pharmaceuticals, cosmetics and electronics: which customer received a product from which batch? For items with an expiration date, FEFO (First Expired, First Out) means shipping the item whose expiration date is nearest first, reducing waste.

4. Multiple warehouses and locations

Track stock at central warehouses, branches, stores and vehicles; locate it by aisle, shelf and bin; and manage transfers between locations, including stock marked “in transit.” As warehouse operations grow, a warehouse management system (WMS) module becomes useful (Warehouse Management Systems).

5. Minimum and maximum levels with automatic reordering

Set a minimum (reorder) and maximum level for each item. When stock falls to the minimum, the system can send an alert or create a purchase request. A common reorder point (ROP) formula is:

ROP = average daily demand × supplier lead time (days) + safety stock

Safety stock accounts for uncertainty in demand and supplier lead time. Calculate it based on the service level you want and how variable demand is. Choosing a fixed number without understanding that variability can cause either stockouts or excess inventory.

6. Cycle counting and discrepancy management

Instead of one large annual stocktake, use cycle counting: group products by value and movement rate, then count each group on a schedule. The system should report discrepancies, track their causes (incorrect entry, loss or waste), and require approval for adjustments.

7. ABC analysis

Classify items by value or sales revenue: A items are few but high-value and need close control; B items are in the middle; C items are numerous but low-value and need simpler checks. A large share of inventory value is often concentrated in a small number of items. ABC analysis helps direct attention and counting frequency where they matter most.

8. Integrations

Connect ERP and accounting systems for purchasing, sales, costing and invoicing; synchronize inventory with e-commerce stores and marketplaces; integrate shipping and suppliers; and check the Revenue Administration's current scope for legal documents such as e-Dispatch Notes (e-Document announcements). See our ERP guide for more.

Inventory costing

The method used to value inventory (FIFO, weighted average, etc.) depends on accounting standards and regulations. Decide with your accountant and apply the chosen method consistently in your system. It affects profit and tax calculations.

Six ways to measure success

1. Inventory accuracy: The percentage of counted stock that matches the system.
2. Inventory turnover.
3. Stockout rate: How often an item is unavailable when a customer wants it.
4. Value of excess and obsolete inventory.
5. Stocktake time and discrepancy value.
6. Order fulfillment time.

Eight criteria for choosing a system

1. Barcode/QR scanner and mobile-terminal support
2. Lot, serial number and expiration-date tracking
3. Multiple warehouses and shelf/bin locations
4. Alerts, reorder suggestions and reports
5. Stocktake tools and discrepancy management
6. ERP, accounting and e-commerce integrations
7. Role-based access and an audit trail
8. Offline operation for warehouses with unreliable connectivity

What Aktaş Digital provides

Our Inventory Management Systems support real-time barcode/QR/RFID tracking, multiple warehouses, lot and expiration-date traceability, automatic reorder triggers and ERP integration. We can also build mobile handheld-terminal applications. Tell us about your requirements in our quote form.

Frequently asked questions

Is Excel enough for inventory tracking?

It can work as a starting point for a small catalog in a single warehouse. As the number of items, locations and users grows, errors, delays and simultaneous-editing problems become more common.

Is it difficult to set up a barcode system?

Preparing product records and printing labels usually takes the most time. Scanning with a handheld terminal or phone app is relatively straightforward. You can start with fast-moving and high-value items.

RFID or barcodes?

For most businesses, barcodes or QR codes are sufficient and more cost-effective. Consider RFID for very high-volume counts or high-value item tracking.

How do I set safety stock?

Calculate it based on variability in demand and supplier lead time, along with your target service level. Using sales and delivery history to calculate it for each item is much better than choosing a fixed number.

How often should inventory be counted?

A common approach is to cycle-count A items more often and C items less often, rather than carrying out one large annual count.

Conclusion

Inventory management means having the right quantity of stock, at the right time, based on accurate data. Combining barcodes, lot tracking, reorder rules and regular counts can free up cash while improving customer satisfaction.