Ries and Trout (1981) popularised the idea that positioning happens in the prospect's mind rather than in the product: a brand occupies a place relative to the alternatives buyers already know. Keller, Sternthal and Tybout (2002) turned that intuition into a discipline built on three questions. First, has the brand established a frame of reference? The frame signals the goal a buyer can expect to achieve by choosing the brand, and so defines which competitors matter. Second, as the authors put it, 'Are we leveraging our points of parity?' These are associations it need not own but must share with rivals, either because buyers see them as necessary for any credible offer in the category (category points of parity) or because they neutralise a competitor's claimed advantage (competitive points of parity). Third, are its points of difference compelling? These are attributes or benefits buyers strongly associate with the brand, evaluate positively and believe they could not find to the same extent in a competitor (Keller and Swaminathan, 2020).

The order matters. Managers tend to leap to points of difference, yet a brand that fails a category point of parity, such as a waterproof jacket that is not credibly waterproof, never gets to argue its difference. Keller and Swaminathan (2020) add three tests for any candidate point of difference: it must be desirable to the target, deliverable by the organisation and differentiating from competitors. Reasons to believe are the evidence that makes a point of difference credible: a process, a guarantee, a heritage, a demonstrable result. In the UK they are also a legal matter, because performance and environmental claims must be substantiated, a point you'll return to in Module 5.

The artefact is a positioning statement, conventionally written as: for [target], [brand] is the [frame of reference] that [point of difference], because [reason to believe]. Its value lies less in the wording than in the choices it forces. Fellwise could frame itself against specialist technical brands, where it struggles on points of parity, or as everyday outdoor clothing for British weather, where its technical credentials become a point of difference against high-street coats. The same product, framed differently, faces different rivals and a different burden of proof.

The positioning tradition assumes buyers choose brands because they perceive them as meaningfully different. Research from the Ehrenberg-Bass Institute challenges that assumption. Sharp (2010) draws on decades of purchase data to argue that brands grow mainly by increasing penetration, winning more buyers (most of them light buyers), rather than by deepening loyalty, and that loyalty metrics largely follow brand size, the pattern known as double jeopardy (Ehrenberg, Goodhardt and Barwise, 1990). When Romaniuk, Sharp and Ehrenberg (2007) asked users across many categories in two countries whether their brand was different or unique, only a small minority said so, yet those brands were still bought. Their conclusion is not that difference is worthless, but that perceived differentiation plays a more limited role than orthodox theory assumes.

What matters instead, on this account, is being easy to think of and easy to buy. Mental availability is a brand's propensity to be noticed or to come to mind in buying situations (Romaniuk and Sharp, 2004); physical availability is the ease of finding and buying it. Brands build mental availability by refreshing memory links with consistent, distinctive branding, so that a colour, logo or character identifies the brand without needing to argue its superiority (Romaniuk and Sharp, 2016). Distinctiveness is about identification; differentiation is about reasons to choose. You'll develop distinctive assets in Module 3.

The critique has its own critics. Bongers and Hofmeyr (2010) argue that the Dirichlet model behind double jeopardy fits aggregate averages while misdescribing individual buyers, so it cannot by itself settle questions about consumer psychology or advertising. Dawar and Bagga (2015) show that performance depends on how central a brand is to its category as well as how distinctive it is. Ritson (2019; 2022) calls the dichotomy false: differentiation need not mean uniqueness, only a relative advantage that some buyers value, and it works best alongside distinctiveness rather than instead of it. And because the Dirichlet assumes stationary markets, an assumption its proponents state openly, it describes the patterns that follow from a brand's share better than it explains how to change that share.

A defensible synthesis gives the two different jobs. A point of difference supplies a reason to choose and something memorable to say; distinctive assets and broad reach ensure that light buyers, who rarely register claims, still recognise and recall the brand.

If mental availability matters, the next question is: available in which situations? Category entry points (CEPs) are the cues buyers use to access memory when a need arises, the motivations, occasions, places, companions and feelings that precede a purchase (Romaniuk and Sharp, 2016). A buyer rarely thinks "outdoor clothing"; they think "it's going to pour on tomorrow's walk" or "I need something warm for the school run". A brand linked in memory to more of these cues, and to the common ones, has more chances to be retrieved and bought. Romaniuk (2023) organises CEPs around prompts such as why, when, where, while doing what, with whom, with what and how the buyer feels.

Identifying CEPs starts with qualitative work (interviews, reviews, search queries and social listening) to capture the category in buyers' own words. It then moves to a survey in which category buyers link brands to a list of CEPs. From those links Romaniuk (2023) derives mental availability metrics: mental market share, the brand's share of all brand–CEP links in the category; mental penetration, the share of category buyers who link the brand to at least one CEP; network size, the number of CEPs linked to the brand among those who link it to any; and share of mind, which shows which other brands buyers retrieve alongside it. Because these metrics cover all category buyers rather than only the brand's customers, they point to where growth could come from.

Prioritising CEPs is a trade-off between prevalence and position. A common CEP where a rival dominates may offer more growth than a niche one the brand already owns, but it is costlier to win. Three questions help. How often does the situation arise for category buyers? How strongly is the brand linked to it compared with competitors? And can the brand's points of difference credibly earn the link? The last question is where CEPs and positioning meet. A positioning that cannot be expressed through buying situations stays an internal statement, while a CEP strategy with no point of difference risks making the brand interchangeable with its rivals. Your priority CEPs will later anchor message strategy in Module 4.

Positions are not permanent. Markets move, and a brand may need to be repositioned or stretched into new categories to keep growing. Both moves draw on the equity built so far, and both can spend it. Repositioning tends to work when the new position builds on associations buyers already hold. Lucozade's widely documented shift in the early 1980s from a drink associated with recovery from illness to one that "replaces lost energy" kept the brand's core link with energy while changing its frame of reference and its target. The Ehrenberg-Bass perspective adds a caution: because most buyers are light buyers who seldom attend to brand communication, memory structures are slow to build and slow to change, so an abrupt repositioning risks discarding assets that took years to form (Sharp, 2010).

Brand extensions raise the same question from the other direction. Aaker and Keller (1990) found that evaluations were higher when perceived fit between the categories (a transfer of skills, a complementary use or substitutability) was combined with high perceived quality of the parent brand, or when the extension was not seen as too easy to make; transfer of skills also had a direct effect. In a large study of extensions, Völckner and Sattler (2006) likewise found fit between parent brand and extension to be the most important driver of success, followed by marketing support, parent-brand conviction, retailer acceptance and parent-brand experience. The risk runs both ways. Loken and Roedder John (1993) showed that an extension inconsistent with the parent's attribute beliefs can dilute those beliefs, weakening the parent rather than lending it a halo. Keller and Swaminathan (2020) distinguish vertical stretches up or down in price and quality, where downward moves risk cheapening the parent and upward ones strain credibility, from horizontal moves into new categories.

An extension risk assessment therefore asks four questions. Does the extension fit what buyers already associate with the brand? Will perceived quality transfer? Can the organisation deliver it? What would failure do to the parent's core associations? Add a fifth from Lesson 2.3: which new category entry points would the extension let the brand own, and do they reinforce or dilute its priority ones? Sub-brands can ring-fence a stretch: the "Fellwise Alpine" line considered in Module 1 would let Fellwise serve climbers while limiting the risk of blurring its position with everyday walkers, although, as that module noted, a sub-brand still sends signals back to the master brand, and an endorsed brand would contain the risk further.