People are constantly mentioning "class this" ... or "class that" ... and using this classification system to justify stacking principals - BUT! Is there an agreement of what a class actually is? And how AAS are classified? Or is it just the interpretation of some people? I HAD originally heard that there are three - and just read a thread on a board I don't contribute on that there are SEVEN!!!??? WTF?

'splain it to me... please!

thanks...