Type, meaning body shape. Chest, width, length of back, tail angle, leg width, proper stance just to name a few. I read the APA SOP for Australorps over and over and over again until I see a picture in my head of what the bird is supposed to look like. Some of my birds come close to that picture and some do not. My biggest fight was with tail angle and overall width of the birds. I hate squirrel tails and crow heads or skinny birds. I also only keep good layers, slakers are gone. Recently I have been working on combs and faces. I like clean faces and triangle points. Spindly points on BA's are a real problem. It is not enough for me me to have a good bird here or there. I want uniformity in my flock and that is the hard part. I have learned the hard way that pretty is not as pretty does in chickens. The best does not always make the best, and that is the real problem. You just keep trying and sometimes you get lucky.
Kurt
From what I understand the later they lay the more mature they are and it helps them and that's my main goal to have some good and healthy bird laying for a lonnnnng time. 
