12 signs that your warehouse needs a WMS

Many warehouses start out simply. Goods are recorded in an enterprise system, tasks are assigned in person or on paper, and experienced workers know exactly where each item is located. This way of working may be sufficient at lower volumes. The problem arises when the company grows:

• the number of stock items increases,
• the number of orders rises,
• new sales channels emerge,
• customer requirements change,
• the warehouse serves production or multiple sites,
• pressure for speed, accuracy and traceability increases.

Processes that were manageable at lower volumes begin to create errors, downtime and additional costs. The solution does not necessarily have to be the immediate expansion of the warehouse or the purchase of additional automation technology. In many cases, the first step is to implement a Warehouse Management System, or WMS - a system that not only records inventory but also manages the execution of warehouse operations.

What is a WMS and what does it manage in a warehouse?

A WMS is a software system designed to manage warehouse processes, from receiving goods through put-away and replenishment to picking, checking and dispatch.

Unlike basic inventory records, a WMS can assign specific tasks to workers and technologies based on:

• current orders,
• the location and availability of inventory,
• defined priorities,
• warehouse rules,
• the capacity of workers and equipment,
• dispatch deadlines,
• the properties and limitations of the goods.

A WMS therefore does not only answer the question of how much inventory a company has recorded. It also helps decide where the goods are located, where they should be moved, who should perform the operation and in what order. However, not every warehouse needs a system with the same scope. The following 12 signs will help assess whether the current method of warehouse management is approaching its limits.

1. Recorded inventory does not match reality

One of the most visible problems is the difference between what the enterprise system shows and what is physically present in the warehouse. Discrepancies may arise from:

• incorrectly recorded receipts,
• unconfirmed movements,
• mix-ups between similar items,
• incomplete picking,
• damage to or loss of goods,
• delayed recording of operations,
• manual re-entry of data.

The consequences are not limited to stocktaking. Inaccurate inventory levels may lead to accepting an order for goods that the company does not actually have, or conversely to unnecessarily reordering items that are merely stored in the wrong location.

A WMS links the physical movement of goods with a digital record. Every receipt, movement, pick or write-off is confirmed when it is performed, for example using a barcode, mobile terminal or automated device. This gives the company a more up-to-date view of its inventory and the exact location of each item.

2. Employees spend too much time looking for goods

If a warehouse worker has to think about where an item might be located for every task, the warehouse process depends on their memory and knowledge of the site. Typical signs include:

• walking between several locations,
• calling colleagues,
• searching for goods left outside their designated location,
• unclear labelling of temporary areas,
• manually checking several packages,
• waiting for the worker who 'knows where it is'.

Time spent searching does not only mean lower productivity. It also creates queues, interruptions to work and the risk that a worker will select the wrong product or batch. A WMS guides the worker to a specific warehouse location and can also determine the optimal sequence of individual stops. With suitable labelling of goods and locations, it also verifies that the worker is handling the correct item.

3. Warehouse performance depends on a few experienced people

Long-serving employees often know the warehouse better than the documentation itself. They know:

• where goods are usually located,
• which orders take priority,
• how to work around a broken process,
• whom to contact when there is a problem,
• which items are often confused,
• what needs to be prepared for a specific customer.

This knowledge is valuable, but it also represents an operational risk. If a key worker is absent, warehouse performance may drop significantly.

Dependence on individuals also complicates:

• training new workers,
• using temporary workers during the season,
• expanding multi-shift operations,
• opening another warehouse,
• standardising processes.

A WMS turns part of individual experience into system rules. The worker receives a clear task, and the system guides them through the individual steps of the operation. Experienced warehouse workers therefore do not have to constantly coordinate the work of others and can focus on resolving exceptions or improving processes.

4. Training new workers takes too long

If a new worker needs several weeks before they can navigate the warehouse independently, the processes are probably not sufficiently standardised. Lengthy training is a problem especially in operations that:

• are growing rapidly,
• work across multiple shifts,
• face seasonal peaks,
• frequently use agency workers,
• have high staff turnover,
• operate a large or complex warehouse.

A WMS can display specific instructions to the worker on a mobile terminal and verify that each step has been completed correctly. A new employee therefore does not need to know the entire warehouse or remember every process exception. The system tells them:

• which task to perform,
• where to go,
• which item to scan,
• what quantity to pick,
• where to move the goods.

This shortens the time needed to work independently while reducing the risk of errors during the first days on the job.

5. Picking errors are only discovered during packing or by the customer

An incorrect item, quantity, batch or package may cause:

• repeat picking,
• delayed dispatch,
• additional transport costs,
• complaints,
• returns,
• a decline in customer confidence.

If the accuracy of an order is only checked at the end of the process, the error has already taken up workers' time and may have blocked further operations. A WMS can verify accuracy continuously. During picking, for example, it checks:

• the identity of the item,
• the required quantity,
• the warehouse location,
• the batch or serial number,
• the expiry date,
• the suitability of the handling unit.

In an e-commerce warehouse, it can also manage piece, batch, cluster or wave picking according to the order profile. More information about the typical weaknesses of online fulfilment can be found in the article The 5 most common mistakes in e-commerce logistics and how to avoid them.

6. Orders are processed in the order in which they were received

A simple 'first received, first processed' sequence may not reflect actual business priorities. Some orders may have:

• an earlier carrier departure time,
• a guaranteed delivery date,
• a higher customer priority,
• specific packing requirements,
• a requirement for consolidation from multiple zones,
• a link to a production or distribution plan.

With manual management, priorities must be continually set by the shift manager or dispatcher. If the situation changes, workers receive new instructions by phone, in person or through spreadsheets. A WMS can sort orders according to configured rules and create tasks so that business and dispatch deadlines are met.

In more complex or automated operations, this capability can be further extended by a WES, which dynamically coordinates the execution of operations and the use of available resources. The difference between the two layers is explained in the article What is the difference between WMS and WES, and why is it even more important today.

7. The warehouse cannot handle peaks without overtime and improvisation

A significant increase in orders does not have to be unexpected. In e-commerce, it occurs during marketing campaigns, Black Friday or before Christmas. In the food industry, it is influenced by seasonality, weather, holidays or the availability of fresh goods. In manufacturing, it may arise from a change in the plan or the launch of a new order. A warning sign is when every peak leads to:

• unplanned overtime,
• manual redistribution of orders,
• blocked dispatch zones,
• replenishment errors,
• a growing number of unfinished tasks,
• restrictions on receiving goods.

A WMS helps standardise work even at higher volumes and makes it possible to deploy additional workers more flexibly. However, the system itself will not solve every capacity constraint. If warehouse performance is limited by a bottleneck, insufficient equipment capacity or an incorrect sequence of operations, the entire workflow needs to be examined.

This topic is discussed in more detail in the article Warehouse performance: Why it is held back by management, not technology.

8. Picking locations are only replenished after they have been emptied

If the need for replenishment is only discovered when a warehouse worker cannot find the required quantity during picking, the process stops. The worker must:

1. report the missing goods,
2. wait for a task to be created,
3. clear space for handling equipment,
4. wait for replenishment,
5. return to the original order.

At higher volumes, such interruptions quickly multiply. A WMS can manage replenishment proactively according to:

• the minimum stock at the location,
• open orders,
• expected demand,
• the capacity of the picking location,
• waves in progress,
• the time required for the movement.

Replenishment can therefore be carried out before a shortage blocks picking.

9. You do not know exactly where delays and bottlenecks occur

The warehouse may dispatch the required volume every day, but at the cost of:

• overtime,
• waiting,
• repeated handling,
• an unbalanced distribution of work,
• excessive use of certain zones,
• improvisation by managers.

Without data on the execution of operations, it is difficult to distinguish whether the problem arises during receiving, put-away, replenishment, picking, packing or dispatch. A WMS records the time and progress of individual tasks. The company can then monitor, for example:

• the number of items processed,
• the time taken to complete a task,
• the number of exceptions,
• zone utilisation,
• the number of unsuccessful attempts,
• delayed orders,
• productivity by process or shift.

Data alone does not guarantee higher performance. However, it makes it possible to identify the cause of a problem more precisely and verify whether the measures taken have actually brought an improvement.

10. Different sales channels compete for the same inventory

A company may use a single warehouse to serve:

• retail stores,
• wholesale customers,
• its own online shop,
• online marketplaces,
• click and collect,
• production or service sites.

Each channel has a different order profile and different requirements. Wholesale may work with cartons and pallets, while e-commerce requires piece picking for a large number of small orders. Retail stores may have fixed delivery schedules, while production needs material at a specific time.

If inventory and priorities are managed separately, conflicts arise:

• the same goods are reserved for multiple orders,
• an urgent order blocks regular distribution,
• the online shop offers goods that are no longer physically available,
• workers use the same picking strategy for different types of orders.

A WMS can manage shared inventory while supporting different processes according to the sales channel, customer type or dispatch priority.

Further options for optimising retail operations are presented in the article 4 ways to improve retail logistics.

11. Batches, expiry dates or serial numbers are checked manually

For fresh food, pharmaceutical products, components or regulated goods, knowing only the total number of units is not enough.

The company also needs to track:

• the batch,
• the production date,
• the best-before or use-by date,
• the serial number,
• the quality status,
• the origin of the goods,
• the link to the customer or production order.

Manual checking increases the risk that the wrong batch will be picked, older goods will remain in the warehouse, or it may not be possible to quickly trace the movement of a specific product in the event of a complaint. A WMS can apply FIFO or FEFO rules and automatically select suitable inventory according to the receipt or expiry date.

If a product needs to be recalled from the market, it also makes it possible to trace:

• where the affected batch is located,
• which warehouse operations it has passed through,
• to whom it was dispatched,
• whether it is still included in orders in progress.

The importance of real-time management for fresh food is also demonstrated by the case study HORTIM: Comprehensive management of food logistics and the cold chain.

12. The company wants to automate the warehouse but does not have standardised processes

Conveyors, stacker cranes, autonomous vehicles or pick-by-light systems can increase warehouse performance. However, automation cannot decide on its own:

• which order takes priority,
• which inventory needs to be replenished,
• which route the goods should take,
• how to respond to an inventory shortage,
• what to do if a device fails,
• how to divide work between people and technologies.

If processes are unclear or unstable before automation, new technology may only accelerate the existing chaos. A WMS creates a process and data layer that manages warehouse operations and provides automation technologies with the necessary instructions. In larger automated operations, a WES layer may also be required to coordinate individual devices, operators and tasks in progress according to the current situation.

More information about this architecture can be found in the article Managing an automated warehouse and the role of a WES system.

How many of these signs must apply before a company needs a WMS?

There is no universal number. One critical problem may have a greater impact than five minor shortcomings. When making the decision, it helps to assess three areas:

Area	Control question
Risk	Does the problem cause complaints, downtime or losses?
Frequency	Is it an exception or an everyday situation?
Growth	Will the problem worsen as order volumes increase?

 

If the problem recurs, has a measurable impact on operations and will worsen with further growth, it is advisable to examine whether it can be eliminated by changing the process or implementing a WMS.

A WMS is not only for large automated warehouses

A WMS is often associated with large distribution centres. However, the need for a managed warehouse is not determined solely by its floor area or number of workers.

Even a smaller warehouse may be highly complex if it:

• processes a large number of orders,
• records thousands of items,
• works with short expiry dates,
• serves multiple sales channels,
• requires serial-number or batch traceability,
• supplies production,
• handles high-value goods.

Conversely, a large warehouse with a simple product range and a low number of movements may not need the same scope of functionality. The decisive factor is not the size of the building, but the complexity of the processes, the level of risk and the required performance.

What to prepare before selecting a WMS

Before comparing suppliers and functions, the current operation of the warehouse needs to be mapped.

The basic overview should include:

• types of receipts and orders,
• the number of stock items,
• daily and peak movement volumes,
• the handling units used,
• the picking method,
• batch and expiry rules,
• the existing ERP and other systems,
• the equipment and automation used,
• the main problems and their operational impact.

It is important to define not only what the new system should be able to do, but above all which problem it should solve and how the success of the project will be evaluated.

More detailed recommendations can be found in the article How to choose the right WMS system without losing your mind.

When a WMS alone may not be enough

A WMS manages inventory and warehouse processes. In complex operations, however, it may need to be connected to other layers:

• ERP for commercial, financial and enterprise processes,
• MES for production management,
• TMS for transport planning,
• WCS for the technical control of automation equipment,
• WES for the dynamic coordination of people, technologies and tasks.

The choice of architecture depends on whether the company primarily needs more accurate records and standardised warehouse procedures, or the real-time management of a complex flow of operations. It is therefore advisable not to start with a list of products, but with an analysis of processes, data flows and operational priorities.

A good WMS does not make a warehouse more complicated

The purpose of a WMS is not to add more administration. A well-designed system embeds decision-making rules in day-to-day operations and gives workers unambiguous instructions. The result may be:

• more accurate inventory levels,
• fewer picking errors,
• shorter training time,
• better use of workers and equipment,
• faster order processing,
• greater traceability,
• better preparedness for growth and automation.

However, the benefits depend on the quality of the process analysis, the configuration of rules, integrations and the involvement of future users. Technology works best when it supports a well-designed operating model.

Do you recognise any of these signs in your warehouse?

Inventory discrepancies, slow picking or dependence on experienced workers may not be isolated problems. They are often signs that the current management method no longer matches the volume and complexity of the operation.

An analysis of warehouse processes will help identify:

• the main sources of errors and downtime,
• bottlenecks in the flow of materials and orders,
• processes suitable for standardisation or automation,
• integration requirements,
• realistic priorities for WMS implementation.

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