One model for many brands. According to Kudryashov and colleagues, Unilever is one of the largest multi-brand groups in fast-moving consumer goods, the goods people buy for everyday use. As it bought more companies and put its brand names on more new products, Unilever saw the need for one model for all its brands. The aim was "to coordinate processes better and make them more efficient" (translated) (Kudryashov et al., 2023, p. 76). Montalvo-Arroyave and colleagues make a similar point. They count the Brand Key among the many models that companies create for themselves. Companies do this to meet the specific needs of the organisation and of the markets it serves, especially when they plan to expand abroad and need a standard model (Montalvo-Arroyave et al., 2022, p. 171). EURIB, the European Institute for Brand Management, adds that within Unilever a separate Brand Key is filled in for each brand extension, meaning each new product under an existing brand name (EURIB, 2010, "Brandkey-model: introductie").

A positioning that is relevant and different. The sources do not report this as Unilever's own motive, but they all describe it as what the model is for. EURIB describes the Brand Key as "a model you can use to position a brand" (translated). Its nine steps "can lead to a distinctive and relevant positioning of a brand" (translated) (EURIB, 2010, "Brandkey-model: introductie"). For Montalvo-Arroyave and colleagues, the market's view comes first. The model seeks to define and structure the most important aspects of the brand based on how the market sees it. It also lets managers compare a brand with the brands that consumers use as a point of reference (Montalvo-Arroyave et al., 2022, p. 170). Nick Liddell started working at the brand consultancy Interbrand in 1999. For him, the Brand Key fills a gap in other brand models shaped like wheels or pyramids, which tend to overlook the competition. As he puts it, "it's not enough for a brand to be relevant; it should also be unique" (Liddell, n.d., introduction).

No publication of the Brand Key by Unilever itself is known. Da Silveira and colleagues call it Unilever's own, "proprietary" tool (da Silveira et al., 2013, p. 29). Every account of it is second-hand. EURIB notes that the model is used in various organisations and comes in several forms and under several names, such as "Brand Box". Its origin is "therefore not entirely clear" (translated). Unilever, EURIB says, uses the form shown here (EURIB, 2010, "Brandkey-model: introductie"). When a reader asked for an official source, the EURIB team pointed to a Dutch textbook on positioning co-written by Rik Riezebos of EURIB, not to a Unilever document (EURIB, 2010, reply of March 7, 2017). The date is open, too. Montalvo-Arroyave and colleagues label the model with the year 1990. Kudryashov and colleagues place it in the mid-1990s. Neither cites a Unilever document for the date (Montalvo-Arroyave et al., 2022, pp. 170–171; Kudryashov et al., 2023, p. 76). Of the accounts used here, only one says it rests on information from Unilever itself. It is a table by da Silveira and colleagues, with data "provided by the company, 2009" (da Silveira et al., 2013, p. 30).

The Brand Key is a sequence of steps that leads from the market to the core of the brand. A brand manager who uses it to position a brand "must go through the nine steps in the order given" (translated) (EURIB, 2010, "Brandkey-model: introductie"). The keyhole shows this order from the bottom up. Its lower part holds the starting points. The root strengths recall what made the brand big. The competitive environment covers the competing brands, and the target describes the people the brand wants to reach. The insight names a hidden motive that makes these people buy or not buy. The round top holds what the brand offers and why people should believe it. The benefits say what the brand offers, the values and personality what it stands for. The reasons to believe give proof for its claims, and the discriminator names the real difference from other brands. At the centre sits the essence, the brand in a nutshell (EURIB, 2010, "Stap 1" to "Stap 9"). Four principles shape the model:

• Outside in: steps 2 to 4 look outwards, at competitors, the target group and insights. From step 5, the model zooms in on the internal side of the brand (EURIB, 2010, "Stap 5: Voordelen (benefits)"). EURIB describes the model as based on an "outside-in" approach (EURIB, 2010, "Brand key: sterktes/zwaktes"). Montalvo-Arroyave and colleagues speak of an "external-internal orientation" (translated) (Montalvo-Arroyave et al., 2022, p. 170).
• Rooted in the past: the first step looks back at how the brand became big, so that the brand can build on its past strengths. This keeps the brand from becoming a stranger to its consumers. Change should therefore be gradual where possible (EURIB, 2010, "Stap 1: Historische kracht (root strengths)").
• The essence sums up: the last step condenses steps 5 to 8, from the benefits to the discriminator, into one or two words (EURIB, 2010, "Stap 9: De merkessentie (brand essence)").
• Managers' wishes and consumers' view in one tool: da Silveira and colleagues compare brand models made by companies and consultancies. In the Brand Key version based on information that Unilever provided in 2009, five dimensions are managers' inputs. They say what the managers want the brand to be. These are the benefits, values and personality, reasons to believe, discriminator and essence. Three dimensions are consumers' inputs. They cover the competitive environment "as seen by the consumers", the attitudes and values of current consumers, and the insight into their needs. The authors note that some models of this kind do not separate brand identity from brand positioning (da Silveira et al., 2013, pp. 29–30).

The sources do not agree on the number of fields. EURIB, Liddell, the brand consultancy Branding by Garden, and Montalvo-Arroyave and colleagues all show nine (EURIB, 2010, "Brandkey-model: introductie"; Liddell, n.d., introduction; Branding by Garden, 2026, "The anatomy of the brand key"; Montalvo-Arroyave et al., 2022, p. 171). The company information of 2009 lists eight dimensions and no root strengths (da Silveira et al., 2013, p. 30). Kudryashov and colleagues group the fields into market, brand and product and do not mention root strengths either (Kudryashov et al., 2023, p. 76). Rik Riezebos, replying for EURIB, describes root strengths as part of "the new version" (translated) (EURIB, 2010, reply of July 25, 2018). One reader numbered this step 0 and asked for a source, since Riezebos's textbook does not seem to name it. The EURIB team pointed to the chapter of that book on the organisation behind the brand (EURIB, 2010, reply of September 23, 2019). The names of the fields vary as well. EURIB's sixth step is "values & personality", while Liddell's diagram reads "Values, Beliefs & Personality".

In EURIB's description, using the Brand Key means writing down the essentials of each of the nine steps, about one A4 page in total. The key can describe the current situation, which the model calls the "master key", or the desired future situation, the "vision key". Within Unilever, a separate Brand Key is also filled in for each brand extension (EURIB, 2010, "Brandkey-model: introductie"). Asked whether steps can be skipped, the EURIB team advised going through all of them, because otherwise "the chance is high that you start from wrong assumptions" (translated) (EURIB, 2010, reply of March 18, 2019).

Rik Riezebos, replying for EURIB, describes the Brand Key as more of a model for external analysis. Guidelines for putting the brand into practice then follow from it (EURIB, 2010, reply of July 25, 2018). In replies to readers, the EURIB team also sees a use for brands that sell to other businesses. There, values help to decide which rational arguments to use with customers. The team sees a use for non-profit organisations, too, where other buying motives play a role (EURIB, 2010, replies of May 2, 2019, and October 30, 2019). It recommends the Brand Key for companies that are very good at responding to demand in the market. A company that becomes more innovative and visionary can turn the approach around, from outside-in to inside-out. But it must be able and willing to change (EURIB, 2010, reply of October 30, 2019).

Branding by Garden suggests developing a Brand Key in a workshop with five steps. A team from several departments comes together, from leadership, marketing, sales, product design and customer service. First comes research, such as a competitor analysis, customer interviews or focus groups, internal surveys and an audit of existing communication. The team then works through the nine fields with questions that dig deep. It turns the raw material into short, clear statements. Finally, the key becomes part of everyday language in the company, for example through training and through the way new staff are introduced (Branding by Garden, 2026, "How to build your brand key").

Drawing on its consulting work, Branding by Garden warns of four mistakes when companies develop a Brand Key (Branding by Garden, 2026, "Common pitfalls to avoid when developing your brand key"):

• A marketing-only exercise: a Brand Key made by the marketing department alone fails at its main purpose. That purpose is alignment, so that the whole company pulls in the same direction. If the sales or product team is not on board, customers experience an inconsistent brand (Branding by Garden, 2026, "Mistake #1").
• Aspiration mistaken for reality: it is tempting to describe the brand as it wants to be. But the key must be rooted in truth. Claims, benefits and the discriminator must be backed up by the reasons to believe. A brand that calls itself innovative needs the patents and products to prove it (Branding by Garden, 2026, "Mistake #2").
• Generic brand speak: words such as "synergy", "quality", "passion" and "customer-centric" say little, because any brand can claim them. The key needs sharp, specific and distinctive language (Branding by Garden, 2026, "Mistake #3").
• Set it and forget it: the key is not "a plaque to be framed and hung on the wall". It is "a living document" that should be consulted regularly, from briefing a new campaign to developing a new feature (Branding by Garden, 2026, "Mistake #4").

• Brand wheels and pyramids: Liddell finds that models such as the Bates Brand Equity Wheel and Keller's Brand Resonance Pyramid tend to overlook the competitive element. Their problem is not that they are too complex, but that "they aren't detailed enough". The Brand Key, in his reading, adds what makes a brand unique (Liddell, n.d., introduction).
• Brand ladders: ladders anchor the brand model around an insight and follow a simple, linear logic. But they leave "no room for brand imagery, values or personality" (Liddell, n.d., introduction). The Brand Key also has an insight, but adds values and personality, proof and difference.
• Golden Circle: Liddell contrasts the "nine different types of information" of the Brand Key with the "three basic things" of the Golden Circle. He advises starting with a small, simple set of elements (Liddell, n.d., "Start simple (and keep it simple)").
• Inside-out approaches: for services, and for products that are not easy to change, Rik Riezebos always advises an inside-out approach instead (EURIB, 2010, reply of April 24, 2017).