Welcome to the ninth and final part of the series Tasting analysis like a professional. We have worked our way through the method, the appearance, the aroma, the taste, wine faults, blind tasting, calibrating the palate and the documentation itself in tasting notes and scores. Now we tie the threads together and ask the hardest question of them all: is this a good wine, and how far can it go.
Assessing quality and potential is where craft becomes judgement. It is less about what you happen to like, and more about reading what is actually in the glass. Let us make it concrete, so the assessment becomes something you can justify, and not just a gut feeling.
What you will learn
- Which criteria lie behind a professional quality assessment, and how they connect
- To assess balance, intensity, complexity and length as separate but related parameters
- How typicity and context affect the verdict
- How ageing potential is assessed from the mechanisms that actually drive maturation
What quality means
Sensory analysis is a scientific discipline used to evoke, measure, analyse and interpret reactions to the properties our senses pick up: sight, smell, taste, touch and hearing. When you assess quality, you are therefore leaning on a measurable system, not on personal preference alone. That is the difference between a trained assessment and a preference.
A trained assessment is expected to yield data that are accurate, repeatable, sensitive and reproducible. That is a high ambition, and it is worth remembering: quality is not a statement that the wine is pleasant to drink, but an assessment of how well it fulfils its own potential. In oenology, sensory analysis is used precisely to screen grape varieties, evaluate winemaking methods, assess the effect of yeast strains and lactic acid bacteria, and determine product quality after maturation. The same criteria you can bring into the glass.
The practical starting point is to separate the objective from the subjective. You can perfectly well register an impeccable, precisely made wine and at the same time note that it is not your style. Both are legitimate. The art is to keep them apart, so the assessment remains a craft.
Balance, intensity, complexity and length
The four big parameters in a quality assessment are balance, intensity, complexity and length. They are related but not the same, and that is precisely why they must each be assessed on their own.
Balance
Balance is about the interplay between the wine's building blocks. On the taste side, our basic taste receptors are tuned to sweet, salty, sour, bitter and umami, and the perceived structure is driven among other things by the fixed acids such as tartaric acid, malic acid, succinic acid and lactic acid, as well as by the phenolic compounds, including flavonoids and tannin polymers, that to a large extent determine colour and taste. A balanced wine is one in which no single component stands out unnaturally. Acidity, any sweetness, alcohol and tannin must be able to carry one another. When the balance is in place, the wine feels whole, and you are not searching for something that is missing or sticking out.
Intensity
Intensity is how much there is, not how good it is. A wine's aroma and taste arise from a complex balance of volatile compounds, where the ratio between the substances varies from variety to variety. Some grapes are aromatically rich by nature. Muscat is among the intensely aromatic varieties, where monoterpenes such as linalool, geraniol, nerol and citronellol carry the characteristic scent, while other varieties are more neutral and independent of monoterpenes. High intensity is not in itself a stamp of quality, but it must stand in a sensible relation to the type of wine and to the other parameters.
Complexity
Complexity is the number and layering of impressions, and how they develop. It is worth remembering how many sources a wine's aroma has. Some compounds come from the grape itself, others arise during fermentation via the metabolism of the yeast, and still others form during maturation. Esters contribute fruity notes and are indispensable for wine quality, while C13-norisoprenoids formed by oxidation of carotenoids give everything from flowers to exotic fruit. Barrel maturation adds its own phenolic compounds from the oak. The more of these layers that play together without treading on one another, the more complex the wine feels. Note that complexity and intensity do not go hand in hand: a quiet wine can be deeply complex, and a loud wine can be simple.
Length
Length, or finish, is how long the taste impression lingers after you have swallowed or spat. A long, clean and evolving aftertaste counts positively, because it typically reflects concentration and quality in the aroma-active compounds. A short or quickly disappearing finish correspondingly drags it down. Notice whether the aftertaste keeps its balance, or whether it falls apart into, for example, bitterness or warmth from alcohol.
Typicity and context
No wine is assessed in a vacuum. Typicity is the question of whether the wine tastes the way its grape variety, origin and style dictate. Here it is useful to know that the composition of volatile compounds is strongly influenced by both grape and winemaking.
Take the green, vegetal notes in Sauvignon blanc and Cabernet Sauvignon, which come from methoxypyrazines. The level is higher in grapes grown under cool conditions than warm ones, and it falls markedly during ripening. A pronounced green character can therefore be typical of the style or tell you about the growing conditions, and that is context you bring into the verdict. In the same way, the tropical, fruity thiols in Sauvignon blanc depend to a large extent on the chosen yeast strain, which reminds us that part of what we perceive as grape character was actually decided in the cellar.
Context is also about practical conditions in the tasting itself. Sensory assessments are best carried out in surroundings that are temperature-regulated, odour-free and calm, and where the assessors cannot see one another and influence one another. This is not pedantry. Our sense of smell alone works with around 1,000 protein receptors, and during normal breathing only about 5 percent of the inhaled air reaches the olfactory receptors, while it rises to around 20 percent when you sniff actively. How and where you taste therefore measurably changes what you pick up.
Assessing ageing potential
Ageing potential is the most difficult assessment, because you are judging a future you cannot taste yet. But maturation is not magic, it is chemistry, and if you understand the mechanisms, you can read the direction in a young wine.
Maturation and ageing cover biochemical reactions after the first racking that improve the wine rather than spoil it. Ageing enriches the wine with aroma-active compounds, stabilises the colour and improves complexity in the mouth. Three types of reactions take place simultaneously during maturation: extraction of the wood's constituents, oxidation of components and reactions between organic substances that form new congeners. It is a slow, controlled oxidation that brings about the central changes in taste and bouquet, but too strong an oxidation harms the wine. Ageing potential is therefore fundamentally a question of whether the wine has the building blocks that can develop positively before the oxidation tips over.
What do you look for. Phenolic structure, including tannin, is part of the foundation, as is the level of the acids. In aromatic wines such as Muscat, hydrolysis of terpene glycosides actually increases the varietal aroma over time, and hydrolysis of glycosides can at higher temperatures lift the intensity of oak, honey and smoky notes. That is the explanation why some wines gain, rather than lose, with time. Note too that older, barrel-aged wines are more resistant to heat-induced changes than younger wines, because the younger ones have higher levels of yeast-synthesised esters.
A useful principle about speed: the temperature coefficient Q10 means that the chemical reactions in wine double for every increase of 10 °C. Ageing therefore takes place more slowly in cool conditions and faster in warm ones. Light white wines such as Riesling mature faster than heavy red wines. SO2 here plays its dual role: it delays ageing by consuming oxygen through the oxidation of sulphurous acid, but is at the same time important for the wine's maturation and stabilisation. When you assess potential, you are really assessing whether the wine's structure, acidity and aroma precursors can withstand the slow journey, or whether it has already given the best it has.
In short
- Quality is a measurable, trained assessment of how well the wine fulfils its potential, and must be kept separate from personal preference.
- Balance, intensity, complexity and length are related but independent parameters. Intensity and complexity do not necessarily go hand in hand.
- Typicity is assessed in the context of grape, origin and winemaking, where for example methoxypyrazines and thiols reveal both growing and cellar work.
- Ageing potential is read through the chemistry of maturation: slow oxidation, glycoside hydrolysis, phenolic structure and the protective role of SO2, all governed by temperature via Q10.
Frequently asked questions
Is an intense wine always better than a restrained one?
No. Intensity only says something about the quantity of impressions, not about the quality. A quiet wine can be deeply complex and finely balanced, while a very intense wine can be simple and one-dimensional. Assess the parameters each on their own.
Can I determine ageing potential from the taste today alone?
Not with certainty, but you can read the direction. Look for acidity, phenolic structure and aroma precursors that can develop, and remember that light white wines mature faster than heavy red wines, and that temperature governs the speed through Q10.
Ready for the next step?
With this you have been all the way around Tasting analysis like a professional. The best way to keep your judgement sharp is to taste broadly and consciously, and to return to the method when doubt arises. If you want to revisit the foundation, start over with Systematic wine tasting: The method, or sharpen your precision with Calibrating the palate.
By all means take the criteria out into practice and find a bottle you feel like studying more closely in our range. And remember what ultimately counts most at the table: the best pairing is the wine you like with the food you like. Here is to curiosity.