Good point Fcup. I think that to be fair though we may need to have more than one category for measurement.
"Assisted Cleavage" Where the use of hands and or arms is permitted and even encouraged
"Fully Equipped Cleavage" In which wonder bras, underwires, etc are allowed to be worn.
"Free Form Cleavage" The ultimate of the science of cleavology. No assistance whatever is allowed. Use of a wonder bra or other device is cause for disqualification of any data gathered in this category.