Just for controversy of topic and thought, and maybe to create a Standard method (who knows)....? No haters please! To explain how this question "title above" came to be and how my method spawned is simple; I have bad eyes (10% floaters) and at reading distance, I see double letters and lots of spots.This goes to say that even though I can visually see cracks during candling, I am unable to determine fertility of an un-incubated egg in my hand due to my vision. I have to wait for larger visual signs of blood vessel development before making the determination. Thus it leads to the question and my method. What is your true Hatch success rate? When I brag my Hatch success rate, it is of the number of eggs left AFTER I have Candled and culled for the first time...and then some and I began to wonder if others brag HSR based on others methods? Let me explain! Hatch success rate "for me" refers to all VIABLE hatch-able eggs, It does not refer to all the eggs I cram in the incubator in the beginning!!! Some eggs can be non-viable, infertile, clears, cracked, or accidentally damaged by the turner (me) , etc, in such they will not ever be considered a hatch-able egg. So, they do not get considered as part of the whole count or the number expected to hatch or not hatch? They are only a statistic of non-viable due to circumstance. To amplify the question above with a point of example; a female of menstrual maturity have cycles each month (producing eggs/human ova) but unless they are fertilized, it is just an ovulation (laying an non-fertile egg). Should we consider that as a statistical miscarriage or include the female in statistics that mentions or includes them in statistical pregnancy of a population? What if the woman's baring never able to produce an egg capable of being fertilize such as a "Clear", or even though fertilized it never starts to develop because it is damaged? In contrast, only after the viable egg is fertilized, and the fetus starts to develop do we consider it a pregnancy with potential of birth. In such, the fetus either comes to term or miscarriages. Thus, for the poultry egg, as for all life forms I am sure, it is of the viable, fertile, non damaged eggs, that should be counted in statistics of Hatch success rate. Removing those that never stand a chance of hatching during the process of development should never be counted. In such I do not have nor do I expect to have a 100% success in hatch, but I do have a more accurate statistical analysis of my hatch success! What your take?