Check out the American poultry association website. The standard of perfection is used to evaluate all sanctioned shows.
First published in 1874, the American Standard of Perfection is the official breed standard for the poultry fancy in North America. Published by the American Poultry Association, the Standard of Perfection (commonly referred to as "the Standard") classifies and describes the standard physical appearance, coloring and temperament for all recognized breeds of poultry, including chickens, ducks, turkeys, and geese. The Standard is used by American Poultry Association judges at sanctioned poultry shows to judge poultry, and by those who participate in competitive showing selectively breed to select birds that conform to the standard, which lead to the term "standard bred" poultry.
There are 19 classes of poultry recognized by the American Poultry Association. Ten of these classes are devoted to chickens, of which 6 are classes of large breeds and 5 are bantam classes. There are four classes of ducks and three classes of geese, both divided by weight. All breeds of turkeys are grouped into one class.