How are the different level of giftedness defined? I suppose I could try and look this up but I'm here and figured that this is where the experts hang out anyway! wink

I'm not referring to Ruf's levels of giftedness but rather the commonly used acronyms I see on this site. For ie: When we say MG, EG, PG...is it based on IQ? And if so, what are the defining numbers?