It is a product olfactory and taste test carried out by a group of at least 8 professional tasters who, when tasting an oil, note down the type and intensity of the positive attributes (fruity, apple, grass, leaf, tomato, bitter, pungent) and of the defects (winey, musty, earthy, fusty, rancid and sediment). To be defined as extra virgin, an olive oil must not have any defects, identified as such by the majority of the tasters. However, besides the absence of defects, any two extra virgin olive oils can be very different from each other, depending on the characteristics of the more or less complex, balanced, elegant sensory profile, characteristics which make the difference between a common extra virgin olive oil and a “grand cru”, just like for common table wines and great wines.