It is not well known outside of Ireland that there are two breeds of Irish Setters, but is fairly certain, that the Red and White Setter is the older of the two, and that judicious selective breeding evolved the solid red colour. Strong well balanced and proportioned without lumber; athletic rather than racy. Most acceptable companion and friend in the homes and the fields. The Irish Red & White Setter is bred primarily for the field.
See: The German Kennel Club (VDH) for information and video (if available). (Hint: your browser should be able to Translate to English, at least for text (e.g., right click in Google Chrome or Internet Explorer).)
National kennel clubs and breed clubs (see, e.g. Breeding/Health Strategy Documents, below)
Population-level statistics (see, e.g., Swedish Insurance Data, below)
Breed club surveys
There are numerous breed standards.
The basis of breed/conformation shows is the judging of pedigree dogs against the 'Breed Standard', which is a picture in words that describes the range of features that are deemed appropriate for the breed.