Another thing to keep in mind is that all these type descriptors are (genearally) written by xNxx types, which means xSxx types get slightly shafted in descriptions sometimes. There are books out there with better theory and insights than the online stuff.
(And the humanmetrics test online is very skewed to make people get N results, so if people get S, I am very inclined to think that's accurate.)
ISTJs are pretty cool. It's a good type.
