How to Run an Assortment Gap Analysis Without Simply Copying Competitors

A competitor stocks a furniture type, size or style that is missing from your own range. That difference may be a genuine opportunity. It may also be irrelevant to your customers, uneconomic to stock or already covered by a product that appears under a different category.

This is the central problem in an assortment gap analysis: a difference between two ranges is evidence to investigate, not proof that something should be added.

Competitor evidence is useful because it gives you an external view of the category. Circana argues that assortment productivity should be assessed against the market as well as internal plans. But the final decision still needs your customer, brand and commercial evidence.

The practical principle is:

Use competitors to discover questions about your range, then use your own evidence to answer them.

What Is an Assortment Gap?

An assortment gap is an unmet role within your range that may matter to the customers you want to serve.

That role could involve:

• a product type, such as a compact sofa bed;
• a size or configuration, such as a narrow sideboard or left-hand chaise;
• a price position, such as an entry option below the core range;
• a material, finish or style that serves a distinct preference;
• a use case, such as furniture suitable for smaller rooms;
• a serviceable availability need, such as a quicker-delivery alternative.

The important word is unmet. If your current products already solve the same customer need, the competitor may simply offer a different expression of it. That is assortment difference, not necessarily assortment gap.

Likewise, a competitor listing is not evidence of demand, sales, margin or customer satisfaction. Public range data can show what is offered and how that offer changes. It cannot reveal the commercial result behind it.

Begin With a Clear Comparison Frame

Do not compare two entire websites and circle everything that differs. Start with one category and one decision.

For example:

Are we missing an important dining-table option for customers furnishing smaller homes?

Define the comparison frame before collecting products:

• Category: dining tables, not all dining furniture.
• Customer need: compact everyday use with occasional extra capacity.
• Competitor set: retailers that genuinely compete for that customer and purchase.
• Review period: a current snapshot plus enough repeated observations to separate stable ranges from brief listings.
• Level of comparison: product roles and customer needs, not automatic SKU-to-SKU matching.

The guide to choosing competitors and categories to monitor can help define a focused evidence set. A broad but poorly chosen competitor list creates more differences, not necessarily more useful gaps.

Build a Range Map Before Looking for Empty Spaces

Create a simple map of your range and the relevant competitor ranges using the same dimensions. For furniture, useful dimensions often include:

Use consistent labels. “Small dining”, “compact dining” and “apartment dining” may describe the same role on different sites. Treating site navigation as a universal taxonomy can create false gaps.

Do not force unlike products into exact matches. If price or proposition is part of the review, apply a documented comparison standard. The comparable product pricing framework separates exact matches, close equivalents, functional substitutes and category neighbours. The same discipline helps an assortment review: compare roles honestly without pretending different products are identical.

Identify Candidate Gaps, Not Automatic Recommendations

Once the range map is consistent, look for patterns that justify investigation.

A role appears across several relevant competitors

If several credible competitors maintain products serving the same customer need and your range has no clear answer, that is a stronger candidate than one unusual item on one site.

It still does not prove that you should add it. Competitors can share the same weak assumption. But repetition makes the question worth testing.

A competitor deepens a role over time

One newly observed product may be a test, a seasonal listing or something that was simply not detected before. A competitor adding several related products across repeated reviews suggests a more deliberate range position.

Use the catalogue-churn guide to distinguish a stable pattern from products that repeatedly disappear and return. Remember that “first observed” is not necessarily the competitor's exact launch date.

Your range covers the category but not a distinct need

A retailer may stock twenty dining tables and still lack a credible compact extending option. Product count alone can conceal a gap when most products serve the same size, style or price position.

A gap exists only in navigation or labelling

Sometimes the product exists but customers cannot find it through the expected category, filter or wording. That may be a merchandising or discoverability problem rather than a buying gap.

The apparent gap is intentional

Your brand may deliberately avoid an entry price point, a material or a high-return configuration. Record intentional exclusions so the same difference does not reappear as a “new” opportunity at every review.

Test Every Candidate Against Your Own Evidence

This is the step that prevents competitor monitoring from becoming imitation.

1. Customer evidence

Look for signs that the need exists among your audience:

• site searches that return weak or no results;
• customer-service and showroom questions;
• requests captured by sales teams;
• product-page journeys that end without a suitable option;
• feedback about missing sizes, configurations or price points;
• relevant market or customer research.

One anecdote is not proof, but several independent signals can strengthen the case. Absence of a signal is also not conclusive if customers have no obvious way to express the need.

2. Strategic fit

Ask whether the candidate belongs in the range you intend to build.

• Does it serve your target customer?
• Does it support the brand's design and quality position?
• Does it strengthen a priority category?
• Would customers understand why you offer it?
• Does it complement the current range rather than blur its purpose?

A competitor can profitably serve a segment that is wrong for you.

3. Commercial viability

Estimate the complete commercial case, not just the competitor's selling price:

• likely buying cost and gross-margin requirement;
• minimum order quantities and supplier terms;
• storage, handling and display space;
• delivery complexity and damage risk;
• expected return or cancellation exposure;
• photography, content and launch effort;
• markdown risk if the trial fails.

Do not infer the competitor's economics from a public price. Their costs, stock position, supplier relationship and margin are unknown.

4. Substitution and cannibalisation

Would the candidate bring a genuinely new customer need into the range, or mostly move demand from an existing product?

Internal sales and journey data can help identify the products most likely to be substituted. A new option can improve choice while still making the overall range less productive if it fragments demand, stock and marketing attention.

5. Operational feasibility

Furniture creates practical constraints that are easy to overlook in a competitor screenshot:

• Can it be delivered through your normal network?
• Can customer-service teams explain the configuration?
• Are samples or swatches available?
• Can variants be represented clearly online?
• Can the business support spare parts, repairs and returns?
• Does the supplier capacity fit the intended promise?

An attractive gap with no reliable operating model is not ready to fill.

Use a Simple Evidence Scorecard

A scorecard makes the decision explainable. Score each candidate from 0 to 2 on the following dimensions:

Do not turn the total into a universal pass mark. The value is in exposing where the case is strong and where it relies on assumptions.

A high competitor-pattern score cannot rescue zero customer evidence or an unworkable supply case. Equally, a candidate with strong customer evidence but uncertain economics may deserve supplier research rather than rejection.

Classify the Result Before Choosing an Action

Place each candidate into one of four outcomes.

Reject the apparent gap

Use this when the need is already covered, the competitor is not relevant, the product conflicts with your positioning or the commercial case is clearly unsuitable. Record the reason.

Keep it on a watchlist

Use this when the external pattern is interesting but the customer evidence, persistence or product definition remains weak. Set a review trigger, such as another relevant competitor adding the role or the pattern remaining present at the next planned review.

Research the proposition

Use this when a credible need exists but supplier, price, specification or operational questions are unresolved. The next action may be customer interviews, supplier conversations, search analysis or a more detailed range review.

Run a controlled test

Use this when the need, fit and initial economics are credible but uncertainty remains. A limited supplier commitment, narrow variant set, pre-order proposition or selected-channel test may provide better evidence than a full-range launch, depending on your operating model.

Define the test before it begins: intended customer, time period, availability, success measures, review date and exit rule. The aim is to learn whether the gap is real without committing as if the answer were already known.

Hypothetical Furniture Example

Suppose a furniture retailer reviews compact dining tables. Its range includes fixed four-seat tables and larger extending tables, but no compact table that remains small day to day and extends for occasional guests.

Three relevant competitors repeatedly stock this role. That creates a candidate gap, not a buying instruction.

The team then checks its own evidence:

• customer-service notes contain recurring questions about extending tables for smaller rooms;
• site-search language points towards “small extending table” rather than simply “dining table”;
• the role fits the retailer's existing small-space furniture position;
• one supplier can offer a limited finish selection within normal delivery constraints;
• the current fixed tables only partly meet the same need.

The case is strong enough to research and perhaps test. The team does not copy a competitor's design, exact range depth or price. It defines its own specification, supplier case, positioning and test measures.

If the internal evidence had shown no relevant customer need and unacceptable delivery complexity, the correct result would have been to reject the gap even though competitors continued to stock it.

Review the Gap After the Decision

An assortment-gap analysis is not finished when a product is added.

For a test or addition, review:

• whether customers found and understood the proposition;
• whether it brought new demand or substituted existing lines;
• whether the operational assumptions held;
• whether returns, damage and service needs were manageable;
• whether the role deserves more depth, less depth or removal;
• whether competitor activity remained stable or proved temporary.

For a rejected candidate, keep the recorded reason and reconsider only when the evidence changes. This reduces repeated debate and prevents the competitor range from dictating your agenda.

If the initial signal was a newly observed competitor range, the new-product launch review provides a separate framework for deciding what that launch may mean. This article addresses a different question: whether a pattern across competitor ranges reveals a customer need your own assortment may not serve.

How Fido Supports the Review

Fido can help teams collect external evidence by monitoring selected competitor websites and categories for supported product changes. Repeated observations can make it easier to see newly detected products, removals, reappearances and category-level patterns without relying on occasional manual screenshots.

Fido does not automatically prove that two products are equivalent, identify a customer-demand gap or recommend which product to buy. Those decisions require your taxonomy, customer evidence, commercial constraints and human judgement.

Use the monitoring record as one input to the range map:

1. define the category and customer need;
2. observe relevant competitor products consistently;
3. identify a candidate difference;
4. validate it with internal evidence;
5. reject, watch, research or test;
6. review the result over time.

The Takeaway

A useful assortment gap analysis does not ask, “What do competitors sell that we do not?”

It asks, “Which customer need might our range underserve, what external and internal evidence supports that view, and what is the smallest sensible next decision?”

Competitors can reveal a possible blind spot. They cannot establish customer demand, strategic fit or commercial viability on your behalf. When the evidence is separated properly, you can learn from the market without letting another retailer design your range.

Sources

• Circana: Is Assortment Affecting Your Market Share?
• NielsenIQ: Assortment and Shelf Execution
• Journal of Retailing: Why Is Assortment Planning So Difficult for Retailers?