Mark, a classification system is useful only insofar as the objects considered can unambiguously be classified, and said classification has real consequences (beyond prices realized.) Premature vs. full term? Can a newborn be one day premature? No. A week premature? Perhaps, but it would make no difference. A month premature? Absolutely, and medical measures in all likelihood must be taken. Male vs female? Chromosome tests can unambiguously determine that (and some other categories as well), and certainly said classification has real consequences.
Type I vs. Type II? Ummm... not so much. (Sorta like one day premature.)
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