Strategic Group Mapping: Building the Map and Reading It

A strategic group is a set of firms within an industry that follow similar strategies along the dimensions that matter in that industry. Strategic group mapping plots those groups on two axes, and its purpose is to answer a question most competitive analysis skips: which of the firms in this industry is a given firm actually competing with?

The concept comes from Michael Hunt's 1972 doctoral work on the domestic appliance industry, where he found that firms did not behave as a single competitive population and that grouping them by strategy explained profitability differences the industry average concealed. Porter developed it into the standard analytical tool.

Why the industry is the wrong unit

Industry-level analysis assumes the firms in an industry face the same conditions. They frequently do not.

Within one industry, some firms compete on price and volume, others on specialisation and margin. The threat of a new entrant is high for one group and negligible for another. Buyer power differs, because different groups serve different buyers. Applying a single five-forces analysis to the whole industry produces an average that describes no firm in it.

The strategic group is the intermediate unit: larger than the firm, smaller than the industry, and the level at which competitive interaction actually occurs. Firms compete most directly within their group and only indirectly across groups.

Choosing the axes, which is the whole difficulty

Almost every weak strategic group map fails at this step, and the failures take three forms.

The axes are correlated. Plotting price against quality usually produces a diagonal line, because in most industries they move together. A map on which every firm lies on a diagonal has one dimension, not two, and tells you nothing the price ranking did not.

The axes are not strategic. Size and profitability are outcomes, not choices. A map of large-and-profitable against small-and-unprofitable describes results and cannot explain them.

The axes are not the ones that matter here. The dimensions have to be the choices that distinguish behaviour in this particular industry: distribution channel, geographic scope, degree of vertical integration, breadth of range, technology, brand position, service level, target segment.

The working test is that the axes should be independent choices a firm could make differently without changing the other, and that moving along one should have competitive consequences. Two axes that satisfy both produce a map with firms spread across it, which is the visual sign that the choice was sound.

Building the map

Identify the strategic dimensions on which firms in the industry differ. List more than two; you will use two and the others are candidates for a second map.

Select two that are uncorrelated and consequential, applying the test above.

Plot every significant firm, not a convenient subset. Omitting firms that do not fit is how a map comes to confirm what the analyst already believed.

Draw the groups around firms that cluster, and scale each group to its combined market share, so the map carries a third variable without a third axis.

Draw a second map on a different pair of dimensions. A single map is one view of a multi-dimensional space, and groups that look identical on one pair frequently separate on another.

What the map shows

Who the real competitors are. The firms in the same group, not the firms in the same industry. This is the most immediately useful output and it frequently contradicts how a management team talks about competition.

Mobility barriers. These are the strategic-group analogue of entry barriers: the obstacles to moving from one group to another. A discounter wanting to move upmarket faces brand perception, service capability and channel relationships it does not have, and those barriers explain why profitability differences between groups persist instead of being competed away. Mobility barriers are the concept that makes the tool analytical and not descriptive, and an answer that omits them has drawn a picture.

Where competitive pressure is concentrated. Groups positioned close together compete intensely. Groups far apart barely interact. Intensity is readable from the geometry.

White space. Empty regions of the map invite a question rather than supply an answer. Some are empty because nobody has tried; most are empty because the position is not viable — a combination of high service and low price with no volume to support it. Treating white space as an opportunity without asking which of the two it is is the most common misuse of the technique.

A worked example on UK grocery

The axes above — breadth of range against price and service level — separate the sector cleanly, which is the sign they were chosen well.

Volume discounters occupy the low-price, broad-range position with a deliberately restricted assortment within each category, own-label dominance and a cost base built around fewer lines and higher volume per line.

Full-service national chains sit at broad range and higher price and service, carrying tens of thousands of lines, national brands, counters and services the discounters do not attempt.

Premium specialists occupy narrow range at high price and service: the delicatessen, the butcher, the regional chain trading on provenance.

Value specialists are the harder quadrant, and its relative emptiness is informative. A narrow range at low price works only where the narrowness itself creates the cost advantage — frozen-food specialists, single-category discount chains — and outside those conditions the position is squeezed from both sides.

The mobility barriers are then readable. A discounter moving upmarket faces brand perception built over years of price messaging, and a supply chain optimised for few lines. A full-service chain moving down faces a cost base it cannot shed without abandoning the estate and the service proposition that justifies its prices — which is why the sector's competitive response to discounters has been to open separate formats or to compete on price within the existing one, rather than to move on the map.

That last observation is what the tool is for. The map shows that the obvious strategic response is blocked, and names what blocks it.

The limitations

The map is a snapshot. Groups form, merge and dissolve, and a map drawn from last year's positions can mislead about a moving industry. Drawing the same map at two dates and showing the movement is substantially more informative than either map alone.

Group membership is a judgement. There is no statistical procedure that produces the groups; the analyst draws the boundaries, and different analysts draw them differently from the same data.

Two dimensions constrain what can be shown. Firms differ on many dimensions at once, and any map discards most of them. This is why the second map matters.

The empirical support is mixed. Studies testing whether performance differs systematically between strategic groups find the effect sometimes and not always, and the debate about whether groups are real structural features or convenient descriptions has never been settled. The honest position is that the tool is valuable for organising analysis whether or not the groups have independent explanatory power.

How it sits with the other competitive tools

Strategic group mapping is rarely used alone, and knowing what it adds to each companion is worth stating.

With five forces. The map identifies the unit on which the forces should be assessed. Running the analysis at group level, not industry level is the improvement, and it changes the answer: buyer power against a premium specialist is not buyer power against a discounter, because the buyers are different people with different alternatives.

With the resource-based view. Mobility barriers and inimitable resources are describing the same obstacle from opposite sides. What stops a firm moving to a more profitable group is, seen from the incumbent's perspective, what protects its position. Reading the map and then asking which resources hold each barrier in place connects an external tool to an internal one.

With Ansoff or generic strategies. Both describe directions a firm might take. The map shows whether the destination is occupied, by whom, and what would have to be overcome to arrive there — which is the question the other two do not address.

The sequence that works in a case analysis is map first, then forces at group level, then resources for the firm's own barrier. Starting from the industry and narrowing is the natural instinct and produces a weaker answer, because the industry-level forces have already averaged away the differences the map exists to show.

Using it in an assignment

State the dimensions you considered and why you chose the two you did, including the correlation check. That single paragraph separates an analytical map from a decorative one.

Plot every firm the case supplies, and if one does not fit a group, say so, not forcing it — an outlier is a finding, and frequently the most interesting one, because a firm occupying a position nobody else holds is either about to demonstrate why it was empty or about to define a new group.

Then do the part most answers omit: identify the mobility barriers between the groups you have drawn, and use them to explain why any performance difference on the map persists. The map poses the question; the barriers answer it. Where the case supplies enough history, add the movement between two dates, because a group that has been converging on another for three years is telling you something no single snapshot can.