Tom---Thanx for the reference site, I had looked there earlier, but maybe I over looked something, I get accused of that often! I am curious if there is a definitive answer, (i.e. range of horsepower, H.P. to weight, or combination thereof.) To me it is still a confusing issue. I purchased four tractors over a period of 30 years from SAC Ford Tractor, and they are good people to do business with. the last purchase was over the phone, and it was for a NH/Ford 1720, and Harold said, "oh, you want another COMPACT!" I said, "WHAT!" It was in July 2000, and I wasn't sure we were on the same page, because the 1720 weigh's 2800#, BUT ONLY 28 h.p. Upon further conversation, I asked why they called them compacts; even he didn't know the answer, and I have never seen it defined or published anywhere?