Inventory management
Inventory management is about keeping track of which items you have in stock, how much is available, and when to reorder. The goal is to have the right items available when they're needed, without tying up more capital in inventory than necessary.
For manufacturers and distributors, inventory management affects purchasing, delivery performance, customer service, and financial performance.
What does inventory management involve in practice?
In practice, inventory management involves a range of activities and decisions, including:
- Reordering: when to place new orders and how much to order
- Stocking decisions: which items to keep in stock and which can be ordered on demand
- Inventory tracking: recording stock movements and keeping inventory records up to date, so the figures in your system match what's actually in stock
- Service levels: what level of availability to aim for across different items or product groups
- Safety stock: how much additional stock to hold to account for uncertainty in demand and lead times
Inventory policies form the basis of day-to-day inventory management. As items are sold or used, stock levels change, and replenishment needs to be planned based on demand, lead times, and established inventory thresholds. Stock levels also need to be monitored continuously so the business can respond to changes and avoid both shortages and excess inventory.
What's the difference between inventory management and inventory optimization?
Inventory management and inventory optimization are closely related, but they're not quite the same thing.
Inventory management is the overarching discipline: planning, monitoring, and controlling your stock.
Inventory optimization is part of inventory management. Here, you work systematically to improve the balance between item availability, tied-up capital, and cost by analyzing demand, lead times, and stock levels, among other things.
In short: inventory management is about managing your inventory. Inventory optimization is about improving how you manage it.
What are the most common mistakes in inventory management?
A classic mistake is not having an accurate picture of your inventory. When inventory data isn't up to date, you can end up reordering items you already have on the shelf, or spotting shortages too late. That leads to both excess stock and backorders.
Another mistake is managing every item the same way. A high service level across the entire range sounds great to customers. It gets expensive fast. Items with unpredictable demand often need proportionally larger safety stock to reach the same service level as items with stable demand. That's why inventory policies should be tailored to each item's importance and demand, rather than treating the whole range the same.
A third mistake is failing to adjust inventory policies when conditions change. Reorder points and safety stock levels that worked last year aren't necessarily right today. Shifts in demand and lead times call for ongoing follow-up, so you avoid both building up unnecessary stock and running out.
How do you improve your inventory management?
Start by building an overview of your stock, demand, and lead times. That gives you a basis for deciding which items need to be available, when to reorder, and how much stock you actually need.
Ask yourself some clear questions: Which items keep running out? Which ones sit on the shelf longer than expected? Where are lead times unstable? And do your current stock levels actually match real demand?
Use the answers to set and adjust inventory policies for different items — reorder points, safety stock, and service levels, for example. That way, inventory management gets tailored to each item's importance, demand, and lead time, instead of treating the whole range the same.
Regularly monitor stock levels, item availability, and replenishment. That makes it easier to spot changes and take action before they lead to shortages or excess inventory.