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Science · Tasting

Flavour language

How the coffee trade puts flavour into words – the World Coffee Research Sensory Lexicon, the Coffee Taster’s Flavor Wheel built from it, and the tick lists of the SCA cupping form – and where shared words fall short.

Across the chain: Science

Source-checkedby Coffearium verification pass· Last source-checked 15 Oct 2026· Prepared with AI assistance· 18 sources (11 tier A)· 2 contested· Updated 15 Oct 2026
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Contents
  • The World Coffee Research (WCR) Sensory Lexicon defines 110 aroma, flavour and texture attributes of coffee, each with a reference against which it is measured.8,3
  • The 2016 Coffee Taster’s Flavor Wheel arranges the lexicon’s attributes from general terms in the centre to specific ones at the rim, grouped by how 72 experts sorted them.5,6
  • The descriptive form of the SCA Coffee Value Assessment (CVA) turns the wheel’s nine inner categories and several middle-ring ones into tick boxes; more precise notes are written in.1,2
  • Shared words do not guarantee shared meaning. Experts from five countries given the same lexicon used different terms for the same espressos.11
  • Label words change what consumers expect and perceive; the same coffee was described differently once tasters were told about it.13,14

Why coffee needs shared words#

Coffee is bought, sold and blended largely on how it tastes. The trade therefore needs words that mean the same thing to a producer, a buyer and a roaster.2,12 “Flavour notes” printed on many coffee packages carry the same descriptions on to consumers.2

Everyday words are not precise enough for this. One taster’s “fruity” may be another’s “fermented”. Sensory science solves the problem with a lexicon: a list of attributes, each with a written definition and a physical reference.3,9 A reference is a sample that shows what the word means, such as a solution or a food smelled from a covered cup.2,3 WCR presents its lexicon as a universal language of coffee’s sensory qualities.3

Since 2024, coffee’s flavour words have come in three linked layers. The World Coffee Research Sensory Lexicon defines the words. The Coffee Taster’s Flavor Wheel arranges them. The cupping form of the Specialty Coffee Association (SCA) turns the wheel’s main groups into tick boxes.1,5,6

The World Coffee Research Sensory Lexicon#

The Sensory Lexicon of World Coffee Research (WCR) was developed at the Sensory Analysis Center of Kansas State University.3,4 A second laboratory, at Texas A&M University, validated it.3 It was built from 105 coffees evaluated by a trained panel and was published in 2016.9,12 It names 110 attributes of aroma, flavour and texture.8,4

Each entry gives a definition and one or more references. Most references also carry an intensity score, so a taster can judge how strong an attribute is, not only whether it is there.3 A second version added new, globally available references for a number of attributes.3,4 WCR offers the lexicon free for personal-use copies.4 We describe it here and link to it, but do not reproduce its definitions.

The lexicon was written for trained sensory panels. According to the SCA, wheel users without that training can still use its definitions and references.6 Its authors call it a “living” lexicon, to be updated as new attributes appear; defects were not studied in the original work.8

The Coffee Taster’s Flavor Wheel#

The first Coffee Taster’s Flavor Wheel was published by the Specialty Coffee Association of America more than 20 years before its 2016 redesign.5,7 The 2016 wheel, made with WCR, is built on the Sensory Lexicon.5,6,7

Its layout came from a study, not from a committee. Seventy-two experts sorted the lexicon’s attributes into groups online, without tasting anything.5 A statistical method then joined attributes that were often sorted together into clusters and levels. A second method placed the clusters around the wheel.5

The result reads from the centre outwards. General words such as “fruity” sit in the inner ring; more specific ones such as a single fruit sit at the rim.6,1 According to the SCA, colours help the eye find a word. A gap between neighbouring segments means the experts saw them as less closely related.6 The wheel is a copyrighted SCA and WCR product; we describe it and do not reproduce it.7

From the wheel to the cupping form#

In 2024 the SCA adopted a descriptive assessment as part of its cupping system, the Coffee Value Assessment (CVA). Its form records what a coffee tastes like, separately from how much the taster likes it.1,2 The taster rates the total intensity of each section on a 15-point scale and ticks descriptors on check-all-that-apply (CATA) lists.1

The tick boxes are taken from the wheel’s inner and middle rings. Each box also stands for the more specific words in the outer ring around it.1 The fragrance-and-aroma list has the nine inner categories plus several middle-ring ones, such as berry, dried fruit and citrus fruit.2 If a coffee tastes clearly of blueberry, the taster ticks “berry” and “fruity” and writes “blueberry” in the notes.1

Box on the form What is chosen Source
Fragrance and aroma Up to 5 olfactory descriptors SCA 103-20241
Flavour and aftertaste Up to 5 retronasal descriptors (same list) and up to 2 main tastes SCA 103-20241
Acidity, sweetness Free words only; no list SCA 103-20241
Mouthfeel Up to 2 terms: rough, oily, smooth, mouth-drying, metallic SCA 103-20241
12345
  1. Lexicon. Attributes of aroma, flavour and texture, each with a definition and one or more references.3,8
  2. References. Physical samples that show what each word means; most carry an intensity score.3
  3. Expert sorting. Seventy-two experts grouped the attributes without tasting; clustering and scaling turned their groups into levels and positions.5
  4. Wheel. Three tiers, general in the centre and specific at the rim.5,6
  5. CVA descriptive form. Intensity on 15-point scales; the inner and middle rings become tick boxes, and finer notes are written in.1
How coffee’s flavour words travel from the lexicon through the wheel to the cupping form. Our own drawing; the ring stands for the wheel and is not a copy of it. Schematic, not to scale.

Mouthfeel needed words that the lexicon does not fully cover, so the SCA added some of its own.2 Acidity has no tick list because there are no sensory references for terms such as “juicy” or “bright” acidity.2

Our flavour wheel tool lays out the same vocabulary. Tap a word to see its family and the box it is ticked under on the CVA form; tap a taste for its reference solution.

Tool

Flavour wheel

Explore 85 aroma and flavour attributes in nine families, the five main tastes and the mouthfeel terms, and see where each one is ticked on a CVA cupping form.

Open as a standalone tool →
IN THE MOUTHTasteSaltySourSweetBitterUmamiBERRYDRIED FRUITOTHER FRUITCITRUS FRUITSOURFERMENTEDPAPERY/MUSTYWOODYCHEMICALTOBACCOBURNTCEREALBROWN SPICENUTTYCOCOABROWN SUGARVANILLA/VANILLINBlack teaChamomileRoseJasmineBlackberryRaspberryBlueberryStrawberryRaisinPruneCoconutCherryPomegranatePineappleGrapeApplePeachPearGrapefruitOrangeLemonLimeSour aromaticsAcetic acidButyric acidIso-valeric acidCitric acidMalic acidWineyWhiskeyFermentedOverripeOlive oilRawUnder-ripePeapodFreshDark greenVegetativeHay-likeHerb-likeBeanyStaleCardboardPaperyMoldy/dampMusty/dustyMusty/earthyWoodyAnimalicMeaty brothyPhenolicBitterSaltyMedicinalPetroleumSkunkyRubberPipe tobaccoTobaccoAcridAshySmokyBrown roastGrainMaltPungentPepperAniseNutmegCinnamonClovePeanutsHazelnutAlmondChocolateDark chocolateMolassesMaple syrupCaramelizedHoneyVanillaVanillinOverall sweetSweet aromaticsFLORAL · 4FRUITY · 18SOUR/FERMENTED · 10GREEN/VEGETATIVE · 10OTHER · 16ROASTED · 8SPICE · 6NUTTY/COCOA · 5SWEET · 8SaltySourSweetBitterUmamiFloral4Fruity18Sour/Fermented10Green/Vegetative10Other16Roasted8Spice6Nutty/Cocoa5Sweet8
Touch · mouthfeel
Our own design, not the SCA/WCR wheel. Attributes and grouping follow the 2016 wheel study and the boxes the CVA form; definitions link to the WCR Sensory Lexicon.5,1,3

Experts, consumers and words#

Experts and consumers use flavour words differently. Studies of wine tasters, reviewed in a 2017 textbook chapter, found experts more accurate and consistent than novices in identifying odours. Their advantage lay mainly in using specific words for particular notes.12 The same chapter notes that labels can shift how a smell is perceived.12

Coffee studies point the same way. In a Brazilian survey of 1,005 respondents, chocolate was the flavour consumers most expected in specialty coffee.13 When 101 consumers tasted one coffee without information, they ticked more caramel; told about the coffee, they ticked more citrus.13 In a 2026 study with 180 specialty coffee consumers, the word “fermentation” on a label made the same coffee taste more acidic and less liked.14

Reference values#

Counts and specifications behind the vocabulary, as stated in the sources.

Parameter Value Source
Lexicon attributes 110 (aroma, flavour, texture) Review 2020; WCR8,4
Coffees used to build the lexicon 105, from 14 countries Review 20199
Lexicon quick set 11 flavour characteristics recommended for quick evaluation in genetic research Review 20208
Experts who sorted the attributes for the 2016 wheel 72; online; no tasting Spencer et al. 20165
Attributes sorted for the 2016 wheel 99 flavour attributes of the lexicon (texture and mouthfeel attributes left out) Spencer et al. 20165
Wheel structure 9 main categories, 3 levels; agglomerative hierarchical clustering (clusters, levels); multidimensional scaling (positions) Spencer et al. 20165
CVA intensity scale 15 points, total intensity of each section SCA 103-20241
CVA olfactory tick boxes 24 (9 inner-ring categories plus middle-ring subcategories; our count of the form) SCA 103-20241
Choices per box Fragrance/aroma up to 5; flavour/aftertaste up to 5 plus up to 2 main tastes; mouthfeel up to 2 SCA 103-20241
Mouthfeel terms Rough (gritty, chalky, sandy); oily; smooth (velvety, silky, syrupy); mouth-drying; metallic SCA 103-20241
Taste references Salty 0.20% sodium chloride; sour 0.04% citric acid; sweet 0.52% sucrose; bitter dark-roasted coffee (about Agtron #35); umami 0.10% monosodium glutamate SCA 103-20241
General vocabulary of sensory analysis ISO 5492:2008, confirmed 2024 ISO16
Method for choosing profile descriptors ISO 11035:1994, confirmed 2024 ISO17

The taste references are qualitative examples; for references at defined intensities, the SCA points to the WCR Sensory Lexicon.2 The earlier CVA document gives different concentrations (see Contested).2,1

Lexicons in sensory science#

In sensory science, a descriptive profile has a qualitative step, choosing the descriptors, and a quantitative step, rating their intensity.17,12 ISO 11035 describes a method for identifying and selecting such descriptors; ISO 5492 defines the general vocabulary of the field.17,16 A panel can take its attributes from an existing vocabulary, such as the WCR lexicon or the flavour wheel, or build one in brainstorming sessions.12

Lexicons are made for a purpose and a population. A trained-panel lexicon guides experts to describe every product in a category. Other lists mark which terms consumers can use.8 One attribute pool of 74 brewed-coffee terms was built for both trained panels and consumers; 33 terms were verified with consumers as aroma descriptors, and 28 were flavour descriptors.8 A Japanese study listed 127 descriptors. Thirty were judged usable in consumer studies and 60 suited to untrained coffee professionals.8

Cupping and descriptive analysis use words differently. Cuppers are industry experts who judge quality and add notes from coffee wheels. Trained panels use a lexicon to refine and quantify attributes.8 The SCA treats intensity and description as objective measurements, trainable with references such as the WCR lexicon, and value judgements as a separate test.2

References, calibration and alignment#

A lexicon reference fixes the meaning of a word; an intensity score on the reference fixes a point on the scale.3 Many lexicon references, however, are products sold mainly in US grocery chains, and WCR itself writes that the lexicon is “not truly global”.3

The CVA takes a looser approach for its tick boxes. It lists “category examples” for each box, to be smelled for training and alignment.2 Tasters need not all use the same reference, only a representative example of each category; for finer work the SCA recommends the lexicon references or similar local ones.2 The SCA calls its example list a living document.2,1

In sensory science, calibration means training panelists to use a defined set of references in one specific test.2 The SCA therefore prefers “alignment” for what cupping rooms call calibration.2 For better group performance in descriptive work, the SCA recommends that tasters align their use of intensity scales and descriptors.2 Across radically different cultures and markets, the SCA advises agreeing on the description and “agreeing to disagree” on preference.2 A high-performing descriptive cupper, in its view, is consistent with their own intensity ratings and accurate in their use of descriptors.2

How well shared words work#

Within a group. In a study of 13 Colombian coffees, a trained panel developed 59 terms to profile them.8 Cuppers given the same coffees were reasonably consistent in grading quality but highly variable in describing flavour.8 The authors concluded that cupping gives different information and cannot replace a trained descriptive panel for profiling.10 The SCA, by contrast, reports pilot tests in which professional cuppers produced reliable descriptive results after a few hours of training.2

Across countries. In a 2025 study, 46 experts in France, India, Italy, the Republic of Korea and the USA described the same espressos with a questionnaire built from the WCR lexicon.11 They received the lexicon and guidelines but no separate training.11 Individual experts were largely consistent across three replications, and two samples were rated similarly in all five countries. The terminology, however, differed between countries, and Korean experts used notably distinct terms.11 The authors call for training in the coffee lexicon.11

Between experts and consumers. A 2017 textbook chapter describes expert wording as a bridge that helps consumers anticipate a coffee, but also notes that words can mislead perception.12 It names terms that needed clearer definition, even among experts: quality, sweet perception, intensity or strength, fine acidity and complexity.12 The SCA presents the CVA as a common language along the chain and towards consumers, using standardised descriptors.2

Culture and translation#

Flavour words depend on what people know and eat. In a study of hibiscus tea, lexicons were built in French, Portuguese and English. Training, food culture and familiarity with the product all shaped the words that panelists in four countries used.15 No study opened for this entry compared the coffee lexicon itself across languages.

For coffee, the SCA warns twice about words that do not travel. Some common acidity descriptors, it notes, do not translate to other languages.2 For affective notes, it singles out “funky” as a vague word untranslatable outside English, valued by some tasters and avoided by others.2 Fruit similes cause a related problem: “green apple” may describe an acidity, not an aroma, and suggests malic acid that may not be there.2

Coffee vocabularies have also been built outside English. Besides the Japanese list and the attribute pool above, researchers have developed coffee emotion lexicons for China (53 terms) and Korea (29 terms).8 WCR provides introductions to its lexicon in Japanese and Chinese.4 A University of Aberdeen project with the State University of Campinas, funded for 2024–2025, compares the sensory language and references of professional Brazilian and British coffee tasters.18

How our flavour wheel tool is built#

The tool is our own design and does not copy the SCA/WCR wheel graphic. Its attributes and their grouping into nine families follow the 2016 wheel study.5 The nine families are the inner-ring categories that also head the CVA tick list.2

For each attribute, the tool shows the CVA box under which it is ticked, following the form in SCA 103-2024.1 The five main tastes carry the reference solutions of that standard, and the mouthfeel terms are those of its mouthfeel lexicon.1 Definitions and references are not repeated: each word links to the WCR Sensory Lexicon.3

Open questions#

  • Sweetness. According to the SCA (June 2024), research is under way to establish whether sweetness in coffee is a taste or a cross-modal effect of sweet-smelling compounds.2
  • Acidity words. There are no sensory references for terms such as “juicy” or “bright” acidity, and little research supports specific acidity descriptors.2
  • Defects. Defect attributes were not studied when the lexicon was developed.8
  • Global references. Many lexicon references are hard to obtain outside the USA.3,2
  • Cross-cultural meaning. Experts in different countries use different terms even with the same lexicon11; how far training closes the gap is not established.

Key studies#

Spencer et al., 2016 – Designing the flavour wheel. Seventy-two coffee experts sorted the attributes of the WCR Sensory Lexicon online without tasting. Hierarchical clustering of their sorts set the groups and levels, and multidimensional scaling placed them around the new Coffee Taster’s Flavor Wheel.

Journal of Food Science 81(12), S2997–S3005 · doi:10.1111/1750-3841.13555

Di Donfrancesco et al., 2014 – Cupping versus descriptive analysis. Thirteen Colombian coffees were profiled by a trained descriptive panel and assessed by cuppers. The cuppers’ flavour notes varied widely, and the authors concluded that cupping cannot replace descriptive analysis for profiling coffee.

Journal of Sensory Studies 29, 301–311 · doi:10.1111/joss.12104

Choi et al., 2025 – One lexicon, five countries. Forty-six experts in France, India, Italy, Korea and the USA described espressos three times with a questionnaire based on the WCR lexicon. Individuals were mostly consistent, but terminology differed between countries, which the authors read as a need for lexicon training.

Foods 14(4), 593 · doi:10.3390/foods14040593

Bressani et al., 2021 – What consumers expect and perceive. A survey of 1,005 Brazilian respondents found chocolate the most expected flavour in specialty coffee. In a CATA test with 101 consumers, information about the coffee shifted their choice of descriptors from caramel towards citrus.

Food Science and Technology 41(Suppl. 2), 667–675 · doi:10.1590/fst.30720

Carvalho et al., 2026 – Words on the label. One hundred and eighty specialty coffee consumers tasted the same coffee under three labels. “Fermentation” made it expected and perceived as more acidic and less liked; “carbonic maceration” raised curiosity without lowering acceptance.

Foods 15(8), 1287 · doi:10.3390/foods15081287

Contested
  • Taste references: the June 2024 CVA document gives 0.15% sodium chloride, 0.015% citric acid, 1.0% sucrose and 1.0% monosodium glutamate as qualitative taste references2; SCA Standard 103-2024 gives 0.20%, 0.04%, 0.52% and 0.10%.1 The standard is the later and normative text.
  • Cuppers as describers: in a Colombian comparison, cuppers were reasonably consistent in grading but highly variable in describing flavour8,10; the SCA writes that its own pilot tests found professional cuppers able to produce reliable descriptive results after a few hours of training.2
Share or cite this entry

Sources

  1. A/BSpecialty Coffee Association (2024). SCA Standard 103-2024 Coffee Value Assessment: Descriptive Assessment. Specialty Coffee Association.
  2. A/BSpecialty Coffee Association (writing team Fernández-Alduenda, M.; Ionescu, K. E.; Giuliano, P.; Rugolo, J.; Delrue, R.) (2024). A System to Assess Coffee Value: Understanding the Specialty Coffee Association’s Coffee Value Assessment (June 2024). Specialty Coffee Association.
  3. BWorld Coffee Research (2017). World Coffee Research Sensory Lexicon: Unabridged Definition and References, Version 2.0. World Coffee Research.
  4. BWorld Coffee Research Sensory Lexicon. World Coffee Research.
  5. ASpencer, M.; Sage, E.; Velez, M.; Guinard, J.-X. (2016). Using Single Free Sorting and Multivariate Exploratory Methods to Design a New Coffee Taster’s Flavor Wheel. Journal of Food Science 81(12), S2997–S3005. doi:10.1111/1750-3841.13555 · other copies
  6. BSpecialty Coffee Association How to Use the Coffee Taster’s Flavor Wheel in Eight Steps. Specialty Coffee Association (SCA News).
  7. BSpecialty Coffee Association The Coffee Taster’s Flavor Wheel (SCA store page). Specialty Coffee Association.
  8. ASeninde, D. R.; Chambers, E., IV (2020). Coffee Flavor: A Review. Beverages 6(3), 44. doi:10.3390/beverages6030044 · other copies
  9. ASuwonsichon, S. (2019). The Importance of Sensory Lexicons for Research and Development of Food Products. Foods 8(1), 27. doi:10.3390/foods8010027 · other copies
  10. ADi Donfrancesco, B.; Gutierrez Guzman, N.; Chambers, E., IV (2014). Comparison of Results from Cupping and Descriptive Sensory Analysis of Colombian Brewed Coffee. Journal of Sensory Studies 29, 301–311. doi:10.1111/joss.12104 · other copies
  11. AChoi, J.; Lee, J.; Chambers, E., IV (2025). Cross-Cultural Comparison of the Espresso Protocol Repeatability. Foods 14(4), 593. doi:10.3390/foods14040593 · other copies
  12. BThomas, E.; Puget, S.; Valentin, D.; Songer, P. (2017). Sensory Evaluation—Profiling and Preferences. In: Folmer, B. (ed.), The Craft and Science of Coffee, Academic Press, ch. 18, pp. 419–456.
  13. ABressani, A. P. P.; Martinez, S. J.; Batista, N. N.; Simão, J. B. P.; Schwan, R. F. (2021). Into the minds of coffee consumers: perception, preference, and impact of information in the sensory analysis of specialty coffee. Food Science and Technology (Campinas) 41(Suppl. 2), 667–675. doi:10.1590/fst.30720 · other copies
  14. ACarvalho, F. M.; de Sousa, M. M. M.; Nadaleti, D. H. S. (2026). Label Information About Fermentation Processing Affects Consumers’ Sensory and Hedonic Judgements of Specialty Coffee. Foods 15(8), 1287. doi:10.3390/foods15081287 · other copies
  15. AMonteiro, M. J. P.; Costa, A. I. A.; Franco, M. I.; Bechoff, A.; Cisse, M.; Fliedel, G.; Tomlins, K.; Pintado, M. M. E. (2017). Cross-cultural development of hibiscus tea sensory lexicons for trained and untrained panelists. Journal of Sensory Studies 32(5), e12297. doi:10.1111/joss.12297 · other copies
  16. AInternational Organization for Standardization (2008). ISO 5492:2008 Sensory analysis — Vocabulary. ISO.
  17. AInternational Organization for Standardization (1994). ISO 11035:1994 Sensory analysis — Identification and selection of descriptors for establishing a sensory profile by a multidimensional approach. ISO.
  18. AUniversity of Aberdeen, School of Social Science; State University of Campinas Cross-cultural taste: Exploring sensory language disparities in coffee evaluation for the global market. University of Aberdeen.

Tier A · authoritative · B · trade and expert · C · general. Supporting quotes for every source are in the data version of this entry. If a publisher’s site refuses access, try the doi link or “other copies”.

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