By systematically going through the A-Z then we can break this ‘mental block’ relatively easily. In addition to determining for example, that a specific fragrance is fruity and green, we also have eliminated the presence of ali-fat-ic or spice notes. Of cause these determinations can be corrected at any stage in the process but we quickly obtain a starting point to move off from. We go on to build a fairly accurate description of a sample’s odour systematically.