Judging at shows
The precise method used can vary from geography to geography, but the book of standards that covers that specific location breaks down the scale of points that a judge would be working with when assessing a bird. The proportion of points allocated to each feature of the bird will vary from breed to breed, and even from plumage colour to plumage colour within a single breed. The sorts of features that will be used within the judging scale will also vary across the same spectrum. Examples of such features are Type, Head, Eyes, Legs, Size, Colour, Condition, Feathering, Carriage, and Tail - although many of these features are qualitative and subjective.