F4-01: The STP Framework — Marketing's Strategic Core

There is a question that separates competent marketers from dangerous ones, and it has nothing to do with creative talent, digital fluency, or data analytics prowess. The question is this: who are we for?

It sounds disarmingly simple. But answering it properly — really properly, with evidence and strategic discipline — is the most consequential decision a marketer will ever make. Get it right, and every subsequent decision becomes clearer: what to build, how to price it, where to sell it, what to say about it. Get it wrong, and you will execute brilliantly in the wrong direction, spending money with precision on people who will never buy, or spreading yourself so thin that you mean nothing to anyone.

The framework that marketers use to answer this question has three letters: STP. Segmentation, Targeting, Positioning. It is, in the estimation of Philip Kotler, "the essence of strategic marketing" (Kotler & Keller, 2016). It is also, in the estimation of Byron Sharp, a framework that has been taken far too literally and far too far (Sharp, 2010). Both of them are right.

This module sits at the heart of the marketing foundations curriculum. Everything before it — understanding what marketing is (F1), how consumers behave (F2), and how to research markets (F3) — leads here. Everything after it — brand strategy (F5), pricing (F6), and communications (F7) — flows from the decisions made here. STP is the bridge between understanding the market and acting in it. It is where strategy happens.

But it is also where one of modern marketing's most productive intellectual conflicts plays out. On one side: the Kotlerian tradition that says markets are heterogeneous, resources are finite, and strategy means choosing whom to serve and how. On the other side: the Ehrenberg-Bass evidence that says brands grow through penetration, segments overlap massively, and targeting narrows your growth ceiling. This module will take both sides seriously, because the evidence demands it.

Let us begin.

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Part 1: Why STP Exists — The Problem It Solves

1.1 Markets Are Heterogeneous

The fundamental premise of STP is that markets are not uniform. The people who buy cars do not all want the same car. The people who buy coffee do not all want the same coffee. The people who need accounting software do not all need the same features, at the same price point, delivered through the same channels.

This observation seems obvious now. It was not always so. In the early twentieth century, mass production and mass media created an era of mass marketing. Henry Ford's apocryphal line — "any colour so long as it is black" — captured the prevailing logic. Make one product. Sell it to everyone. Use economies of scale to drive costs down and volumes up.

Wendell Smith (1956), in a landmark paper in the Journal of Marketing, challenged this logic directly. He distinguished between "product differentiation" (making your product seem different) and "market segmentation" (recognising that the market itself is already different). Smith argued that market segmentation was not a marketing trick but a recognition of reality: consumers have genuinely different needs, preferences, and behaviours, and a firm that recognises this heterogeneity and responds to it will outperform one that treats the market as monolithic.

Smith's insight was not just academic. It reflected changes already happening in practice. As post-war economies matured, consumer choice expanded, and the "one size fits all" approach became increasingly untenable. General Motors had already demonstrated the power of a segmented approach — offering Chevrolet for the mass market, Buick for the aspiring middle class, and Cadillac for the affluent — while Ford clung to a single-model strategy and lost market leadership.

1.2 Resources Are Finite

The second premise is equally important: no firm has infinite resources. Even the largest multinationals must make choices about where to compete. You cannot serve every need, in every market, through every channel, at every price point. Strategy, as Michael Porter (1985) argued, is fundamentally about choosing what not to do.

STP provides the framework for making those choices. Segmentation maps the terrain — showing you where the different groups of customers are and what they need. Targeting is the strategic decision — choosing which of those groups you will serve. Positioning is the implementation — crafting an offer and a message that is compelling to the chosen group.

Without STP, marketers face two equally dangerous defaults. The first is to try to serve everyone — spreading resources thin, diluting the offer, and ending up with a proposition that is vaguely appealing to many but compelling to none. The second is to target by intuition — serving whoever the founder, the CEO, or the most vocal customer happens to identify with, regardless of whether that group represents a viable commercial opportunity.

1.3 The Sequence Matters

One of the most underappreciated aspects of STP is that it is a sequence, not a menu. You cannot position effectively until you know whom you are positioning for. You cannot select a target until you understand the full landscape of possible segments. And you cannot segment intelligently without the market research that precedes this module (F3).

Kotler and Keller (2016) are explicit on this point: the three steps must occur in order. Segmentation is the analytical foundation. Targeting is the strategic choice. Positioning is the creative and competitive response to that choice. Reverse the order — as many organisations do when they start with a positioning statement and work backwards — and you risk positioning for an audience that does not exist, or that exists but is too small, too unprofitable, or too expensive to reach.

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Part 2: The STP Sequence — How It Works

2.1 Segmentation: Mapping the Market

Segmentation is the process of dividing a market into distinct groups of buyers who have different needs, characteristics, or behaviours and who might require different products or marketing approaches (Kotler & Keller, 2016).

The key word is "distinct." Not all differences matter. The fact that some of your customers are left-handed and some are right-handed is a difference, but it is unlikely to be a meaningful basis for segmentation in most categories. A meaningful segment is one where the differences between groups lead to genuinely different needs, different responses to marketing activity, or different levels of profitability.

We will explore segmentation in depth in the next lecture (F4-02). For now, the critical point is that segmentation is an analytical exercise — it is about understanding the market's structure, not about making strategic choices. The strategic choices come next.

2.2 Targeting: Making the Choice

Targeting is the evaluation of each segment's attractiveness and the selection of one or more segments to serve (Kotler & Keller, 2016). This is where analysis becomes strategy. Given the segments you have identified, which ones will you pursue?

The evaluation criteria typically include:

Segment size and growth. Is the segment large enough to be commercially viable? Is it growing, stable, or shrinking?

Structural attractiveness. How intense is competition within the segment? Are there powerful buyers or suppliers who can extract value? Are there substitutes or new entrants threatening the segment?

Fit with company objectives and resources. Does the segment align with the firm's capabilities, brand, and strategic direction? Can the firm credibly serve this segment better than competitors?

Mark Ritson (2024) adds a pragmatic criterion: accessibility. Can you actually reach this segment with your marketing? A perfectly defined segment that cannot be reached through available media channels is strategically useless, however attractive it may look on paper.

2.3 Positioning: Crafting the Competitive Response

Positioning is the act of designing the company's offering and image to occupy a distinctive place in the mind of the target market (Kotler & Keller, 2016). The concept was popularised by Al Ries and Jack Trout (1981), who argued that positioning is not what you do to a product but what you do to the mind of the prospect.

Positioning answers the question: given our target, how do we want them to think of us relative to the competition? It is the bridge between strategy and execution — the strategic intent that guides product development, pricing, distribution, and communications.

We will devote a full lecture to positioning later in this module (F4-05). For now, the essential point is that positioning is the final step in the STP sequence, and it depends entirely on the two steps that precede it. You cannot position "for everyone." You position for a specific audience, in a specific competitive context, with a specific value proposition. The target determines the position.

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Part 3: The Strategic Questions STP Answers

3.1 Where to Compete

STP forces marketers to confront the question of competitive arena. Not every part of the market is equally attractive. Not every segment is equally contestable. The segmentation and targeting process identifies where the opportunities lie and where the risks are highest.

Toyota provides an instructive example. The company operates across multiple segments — economy (Yaris), family (Corolla, RAV4), premium (Lexus), and performance (GR range) — but it does not compete in every segment. It has largely avoided the ultra-luxury segment (leaving that to Rolls-Royce and Bentley) and the ultra-budget segment (leaving that to Dacia and others). These are deliberate strategic choices about where to compete and where not to.

3.2 How to Win

Within the chosen segment, STP guides the question of competitive advantage. How will you be different from — and better than — the alternatives available to your target? This is the positioning question, and it requires a clear-eyed assessment of both customer needs and competitive offerings.

The error many marketers make is answering "how to win" without first answering "where to compete." They develop a positioning statement that sounds compelling in the boardroom but fails to connect with any identifiable group of buyers. Or they develop a positioning based on what the company is good at, rather than what the target market needs. STP guards against both errors by insisting on the sequence: understand the segments, choose your target, then position.

3.3 Who to Serve — And Who Not To

Perhaps the most valuable contribution of STP is that it forces the question of exclusion. If you are targeting segment A, you are, by definition, not prioritising segments B, C, and D. This is uncomfortable for many organisations. It feels like leaving money on the table. It creates internal debates about whether the chosen segment is large enough, whether adjacent segments should be included "just in case," and whether the brand should be "inclusive" rather than targeted.

Ritson (2024) is characteristically direct on this point: if your target market is "everyone," you do not have a target market. You have a fantasy. The purpose of targeting is to concentrate resources where they will have the greatest impact. A brand that tries to be equally compelling to a 22-year-old university student and a 55-year-old corporate executive is, in most categories, a brand that is compelling to neither.

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Part 4: The Both/And — STP as Essential AND Overextended

4.1 Sharp's Critique

Now we arrive at the tension that will run through this entire module.

Byron Sharp (2010), drawing on the Ehrenberg-Bass Institute's decades of empirical research, has mounted a sustained challenge to the STP orthodoxy. His arguments are not peripheral quibbles — they strike at the foundation of the framework:

Segments overlap massively. Sharp's data shows that the buyers of competing brands look remarkably similar in their demographics, attitudes, and behaviours. The "distinctive segment" that marketing textbooks describe is, in Sharp's view, largely a fiction. Most brands in a category share most of their customers with competitors.

Growth comes from penetration, not targeting. Brands grow by reaching more people, not by targeting a narrow segment more intensely. The double jeopardy law (Ehrenberg, 1972) demonstrates that smaller brands suffer twice: they have fewer buyers, and those buyers buy slightly less often. The remedy is not to target the existing buyers more aggressively but to expand the buyer base.

Heavy buyers are not a stable segment. The conventional wisdom says "focus on your heavy buyers — they generate the most revenue." Sharp shows that heavy buyers in one period are often light buyers in the next. "Heavy buyer" is a phase, not a permanent identity. Targeting them is targeting a moving shadow.

The Pareto ratio is exaggerated. The textbook claim that "80% of sales come from 20% of buyers" is, in Sharp's data, closer to 60% from the top 20%. The remaining 40% — coming from light and occasional buyers — is too large to ignore. And it is from those light buyers that growth disproportionately comes.

4.2 The Defence of STP

The Kotlerian tradition has not taken Sharp's critique lying down. Several counterarguments have force:

STP was never meant to be about ignoring non-target segments. Kotler's framework identifies a primary target to guide strategy and resource allocation. It does not claim that non-target buyers should be actively repelled. The target is a priority, not an exclusion zone.

Category context matters. Sharp's evidence draws heavily from fast-moving consumer goods (FMCG) — categories where purchase involvement is low, switching costs are minimal, and buyer behaviour follows repertoire patterns. In high-involvement categories (financial services, B2B, luxury goods), segmentation and targeting may be more powerful because buyer needs are more differentiated and switching is costlier.

Resource allocation requires focus. Even if segments overlap, a firm with limited resources must still decide where to concentrate its efforts. STP provides the analytical discipline for that decision. "Reach everyone" is not a strategy if you cannot afford to reach everyone effectively.

Positioning requires a perspective. To position effectively — to craft a proposition that resonates — you need a point of view about whom you are speaking to. "Everyone" is not a useful audience for a creative brief. Even Sharp's own recommendation — to build mental availability across the broadest possible audience — requires decisions about which category entry points to prioritise, which is a form of strategic choice.

4.3 The synthesis

Here is where this school earns its name.

The STP framework and the Ehrenberg-Bass critique are not irreconcilable opposites. They are addressing different aspects of the same strategic challenge.

STP is a thinking tool. It forces marketers to understand their market's structure, to make explicit choices about priorities, and to craft propositions that are strategically coherent. A marketer who has not gone through the discipline of STP is strategically illiterate — they are making decisions without understanding the landscape.

The Ehrenberg-Bass evidence is a reality check. It reminds marketers that segments are fuzzier than they appear on a PowerPoint slide, that growth comes from expanding the buyer base, and that over-targeting can shrink a brand's ceiling to the point of stagnation.

The evidence-based marketer does both. They use STP to sharpen their strategic thinking — to understand where to compete, how to position, and where to prioritise. And they use the penetration evidence to ensure they do not fall into the targeting trap — mistaking their target for their total addressable market, ignoring light buyers, or over-investing in loyalty at the expense of acquisition.

Monzo, the UK digital bank, illustrates this synthesis. Its initial target was clear: tech-savvy millennials frustrated with traditional banking. That targeting decision guided everything — the product design (mobile-first), the branding (coral card, informal tone), the distribution (app-only). But as the brand grew, it did not stay trapped in its original segment. It progressively broadened its appeal, adding features (joint accounts, business accounts, salary sorting) that extended its relevance beyond the original target while retaining the distinctive positioning that made it compelling in the first place. STP sharpened the initial strategy. Penetration thinking drove the growth trajectory.

Coca-Cola offers the counterpoint. It appears to defy segmentation — sold to virtually everyone, everywhere, all the time. But look beneath the surface and you find an extraordinarily sophisticated segmentation and targeting operation: different pack sizes for different occasions, different products for different need states (Coke Zero for calorie-conscious drinkers, Diet Coke as a distinct brand with its own audience, Fanta for teens), different communications for different markets. Coca-Cola does not ignore STP. It practises STP at a level of sophistication that makes the individual segments invisible from the outside while reaching the broadest possible market in aggregate.

The lesson: think with STP, act with reach. Use segmentation to understand. Use targeting to prioritise. Use positioning to differentiate. But never mistake your target for your ceiling.

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Part 5: The Road Ahead — What This Module Covers

5.1 The Module Structure

This module will take each element of STP and subject it to the same Both/And treatment — honouring the intellectual tradition while stress-testing it against the empirical evidence.

In F4-02 (Segmentation), we will explore the bases of segmentation — demographic, geographic, psychographic, behavioural, needs-based — and examine when segments are "real" groupings versus constructed analytical tools. We will confront Sharp's evidence that buyer profiles overlap massively, and we will find the evidence-based resolution: segmentation as a useful analytical lens, not a description of reality.

In F4-03 (Targeting), we will enter the most contested ground in modern marketing: the mass versus niche debate. We will examine the IPA Databank evidence that broad-reach campaigns outperform targeted ones, the double jeopardy law that punishes narrow targeting, and the cases where niche strategies genuinely work. The evidence-based resolution: reach broadly and speak relevantly.

In F4-04 (The Penetration Imperative), we will present the Ehrenberg-Bass evidence in full — double jeopardy, the natural monopoly law, the duplication of purchase law — and draw out the practical implications for how brands grow. The evidence-based resolution: penetration first and loyalty second, with the emphasis shifting by category.

In F4-05 (Positioning), we will explore how to craft a position that is both strategically disciplined and creatively inspiring. We will examine positioning frameworks from Ries and Trout to Ritson's "positioning triangle," and we will reconcile Sharp's scepticism about differentiation with the undeniable reality that some brands occupy genuinely distinctive mental positions.

5.2 The Overarching Tension

Throughout this module, a single tension will recur: the Kotlerian tradition says strategy means choosing, and the Ehrenberg-Bass evidence says growth means broadening. These are not contradictions. They are the systole and diastole of good marketing — the contraction that focuses and the expansion that grows. The best marketers are fluent in both.

Let us begin with segmentation.

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Key Takeaways

• STP (Segmentation, Targeting, Positioning) is marketing's strategic core. It is the bridge between understanding the market (F3) and acting in it (F5-F7). Every marketing strategy, implicitly or explicitly, answers the STP questions.

• The STP sequence matters: Segment → Target → Position. You cannot position effectively until you know whom you are positioning for. You cannot select a target until you understand the full landscape of segments. Reversing the order produces strategically incoherent marketing.

• STP exists because markets are heterogeneous and resources are finite. Not all customers want the same thing. No firm can serve everyone equally well. STP provides the discipline for making strategic choices about where to compete and how to win.

• Sharp's critique is empirically grounded and strategically important. Segments overlap, growth comes from penetration, heavy buyers are not a stable segment, and the Pareto ratio is exaggerated. These findings do not destroy STP — they discipline it.

• The Synthesis: think with STP, act with reach. Use segmentation to understand your market's structure. Use targeting to prioritise your resources. Use positioning to craft a compelling proposition. But never mistake your target segment for your total addressable market. The best marketers are strategically focused and commercially broad.

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Sources

Binet, L. and Field, P. (2013). The Long and the Short of It: Balancing Short and Long-Term Marketing Strategies. London: IPA.

Ehrenberg, A.S.C. (1972). Repeat-Buying: Theory and Applications. London: Charles Griffin.

Kotler, P. and Keller, K.L. (2016). Marketing Management. 15th ed. Harlow: Pearson.

Porter, M.E. (1985). Competitive Advantage: Creating and Sustaining Superior Performance. New York: Free Press.

Ries, A. and Trout, J. (1981). Positioning: The Battle for Your Mind. New York: McGraw-Hill.

Ritson, M. (2024). Marketing Week Mini MBA Lectures. Marketing Week.

Romaniuk, J. and Sharp, B. (2022). How Brands Grow Part 2: Emerging Markets, Services, Durables, New and Luxury Brands. Rev. ed. Melbourne: Oxford University Press.

Sharp, B. (2010). How Brands Grow: What Marketers Don't Know. Melbourne: Oxford University Press.

Smith, W.R. (1956). Product Differentiation and Market Segmentation as Alternative Marketing Strategies. Journal of Marketing, 21(1), pp. 3-8.

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Discussion Questions

1. Consider a brand that appears to "target everyone" (e.g., Coca-Cola, Amazon, McDonald's). Does this mean they have abandoned STP, or are they practising STP at a level of sophistication that makes the targeting invisible? What evidence would you look for to determine which interpretation is correct?

2. Sharp argues that growth comes from penetration — reaching more buyers — rather than from targeting a narrow segment more intensely. If this is true, does STP still serve a useful purpose? Or has it become a legacy framework that persists in textbooks but misleads in practice?

3. Think about a purchase you made recently in a high-involvement category (car, home, financial product). Did the brand that won your business feel "targeted" at you — designed for someone like you? Now think about a low-involvement purchase (a snack, a household product). Was targeting visible there? What does the difference tell you about where STP matters most?