Assortment management: how to decide what to keep or phase out
Some products stay in the assortment longer than they should.
They still sell a little. An important customer buys them every now and then. The sales team remembers why they were added in the first place. And there's still stock sitting in the warehouse.
But a little revenue isn't necessarily the same as value.
A product can generate revenue and still tie up too much capital, require large minimum order quantities (MOQ), and create extra work for purchasing and the warehouse. On the other hand, a low-revenue product can still matter — because it's important to a key customer or supports the sale of something else.
That's why a good decision about your assortment needs more than a sales report.
Here's a practical model for assortment management, so you can decide whether a product should be kept, managed differently, turned into a special-order item, or phased out.
What is assortment management?
Assortment management is the ongoing work of deciding which products deserve a place in your assortment — and on what terms.
It's not just about adding new products. A solid assortment strategy also means you keep revisiting the ones you already have.
Assortments rarely get too broad because of one big decision. They grow through a long series of small yeses.
A variant for an important customer. An extra size. A special item for a new market. A spare part nobody ever removed. An old product that still sells just enough that no one raises the question.
Each decision may have made sense at the time.
But together, they can leave you with a product assortment where the capital tied up and the effort to manage it have grown faster than the value.
Assortment optimization: what should you look at?
Working on assortment optimization isn't about cutting as many products as possible. It's about finding the mix that creates the most value relative to the inventory and the work it demands.
Revenue alone is a poor basis for that decision.
When you run a product assortment analysis, there are five questions worth asking about each item.
1. What do you actually earn on the product?
Look past revenue. What do contribution margin and profitability look like once you factor in the handling and inventory the product requires?
A high-revenue product isn't necessarily profitable if margins are thin, orders are small, and handling takes a lot of work.
2. How much capital does the product tie up?
A product can sell reasonably well and still be expensive to carry.
If you have to buy six months of demand at a time to meet a supplier's minimum order quantity, the product ties up far more capital than the sales figure alone suggests.
3. How stable is demand?
Does the product sell fairly steadily, or does it move only a few times a year?
The more uneven demand is, the harder it becomes to hit the right inventory level. You risk sitting on too much inventory — or not having it when a customer actually wants to buy.
4. Who would miss the product if it disappeared?
Not internally. Your customers.
If several important accounts buy it regularly, that's a different situation than if one customer buys it sporadically every couple of years.
A low-revenue product can still earn its place. But you need to know why.
5. How much work does the product create?
Does it require special supplier terms, large minimum order quantities, extra warehouse space, or a lot of manual exceptions?
That cost rarely shows up clearly in the revenue figure. But it's real.
Take a product that generates around $60,000 a year in revenue. On the surface, it looks like an obvious keeper. But if you have to buy six months of demand at a time, the margin is thin, and only two customers order it regularly, the decision suddenly looks different.
That's exactly why revenue alone isn't enough.
How do you decide what happens to the product?
A product assortment analysis doesn't need to end with either keep or remove.
That's too blunt.
In practice, you have four relevant options.
Keep and protect
The product creates value, has stable demand, and matters to your customers.
Here, the task isn't about phasing out. It's about making sure you have the right service level and availability.
Keep, but manage it differently
The product still has a role, but the way you're managing it costs too much.
Maybe the service level should come down. Maybe safety stock should be reduced. Or maybe minimum order quantities and supplier terms need renegotiating.
Many assortment problems don't require the product to disappear. They just require you to stop managing every product like a core item.
Turn it into a special-order item
Some products are worth offering but not worth keeping in stock.
If customers can accept a longer lead time, you can make the product a special-order item. You keep the ability to sell it without tying up the same capital.
Phase it out
Phasing out becomes relevant when the product's value no longer justifies the capital and the work it requires.
That applies especially to products with declining demand, low profitability, high obsolescence risk, or purchasing terms that no longer match sales.
But don't base the decision on a single number.
Low revenue doesn't automatically mean the product should go. High revenue doesn't automatically mean it should stay.
When should you phase out a product?
A product rarely becomes an obvious candidate for phase-out because of one bad metric.
It's the combination that matters.
Declining demand and too much capital tied up in inventory. Thin margin and lots of small orders. Or large minimum order quantities on a product that sells less and less often.
Supplier terms can be especially decisive.
Picture a product that sells 100 units a year but can only be bought in batches of 250.
On paper, the product still has demand. In practice, the purchasing terms force you to buy more than customers actually want and tie up capital in the rest.
And once those 250 units are sitting in the warehouse, the argument shows up fast:
"We just need to sell through the remaining stock first."
The problem is, the next minimum order can start the exact same cycle again.
A decision to phase out products should therefore look at sales, inventory, customers, and supplier terms together.
How does assortment management connect to inventory optimization?
You can't optimize inventory without also looking at the assortment.
Every new product can mean extra safety stock, reordering, warehouse space, and follow-up. If the assortment keeps growing while old products never leave it, capital gets spread thinner and thinner across more SKUs.
A broad assortment can absolutely be the right call.
But a broad assortment has to justify the cost and complexity it creates.
When you evaluate a product, don't just ask how much it sells. Look at how much inventory you need to carry to generate those sales.
That's often where the phase-out candidates become visible.
How do you run a product assortment analysis in practice?
You don't need to start by analyzing every single product in detail.
Start where a decision can make the biggest difference.
Look for products with a lot of capital tied up in slow-moving inventory, declining margin, high obsolescence risk, or suppliers with large minimum order quantities.
Use data to prioritize — not to postpone the decision.
Then work through the five questions:
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What does the product actually earn?
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How much capital does it tie up?
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How stable is demand?
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Which customers depend on it?
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How much work does it create?
Based on that, you choose one of four actions: keep, manage differently, turn into a special-order item, or phase out.
That makes it clear why each product still has a place in the assortment.
How do you carry out a product phase-out?
A phase-out decision isn't worth much if the product remains active in your systems.
When a product is being phased out, you need clarity on:
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the date of the last purchase
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how remaining inventory will be handled
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which customers need to be informed
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whether another product can replace it
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when the product will no longer be available for new orders
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who owns the phase-out
Sales needs to know what they can promise customers. Purchasing needs to know the last order date. The warehouse needs to know what happens to the remaining stock.
Otherwise, the decision is only half implemented.
And the remaining stock can stay on the shelf for a long time.
Make assortment management an ongoing process — not an annual cleanup
The best time to clean up your assortment isn't after too much capital is already tied up in inventory.
Instead, keep a close eye on products where demand, inventory levels, or profitability are moving in the wrong direction.
You don't need to review the entire assortment every month. Start with the exceptions — the items where the numbers tell you something has changed.
And when a decision needs to be made, someone has to own it.
Sales knows what customers are asking for. Purchasing knows the supplier terms. Supply chain can see the consequences for inventory. None of those perspectives can stand alone.
That's how assortment management becomes an ongoing part of the business instead of a major cleanup project.
Frequently asked questions about assortment management decisions
Assortment management is the ongoing work of deciding which products to keep, prioritize, manage differently, or phase out. The goal is a product range that creates value for customers without tying up unnecessary capital or creating unnecessary work.
Assess the product's profitability, capital tied up in inventory, demand, customer importance, and the workload it creates. Then use the analysis to decide whether the product should be kept, managed differently, turned into a special-order item, or phased out.
Look at profitability, capital tied up in inventory, demand, and customer importance together — not at a single number. Once the decision is made, you also need to establish the last purchase date, how remaining stock will be handled, and who owns the phase-out.
Assortment management is the ongoing work around your product range. Assortment optimization is about changing the assortment — or how products are managed — so you get more value from the capital and resources required to support it.
The assortment decision should have one clear owner, but it shouldn't be made in isolation.
Sales knows which products customers are asking for. Purchasing knows the supplier terms. Supply chain can see the impact on inventory and working capital.
The final decision should bring together the perspectives that matter for that product.
Set clear rules for when new products are added, how they're followed up on, and when they should be evaluated for phase-out.
Track capital tied up in inventory, profitability, and demand closely, and build a regular rhythm for assortment decisions.
That way, cleanup becomes an ongoing part of assortment management instead of something you only do once inventory has already become a problem.
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