How do you define "first tier colleges"/second tier/etc...?

<p>Judging from the 2013 US news college rankings ( National</a> University Rankings | Top National Universities | US News Best Colleges )</p>

<p>What do you consider the "top tier"/"mid tier" "3rd tier" schools? For example do you consider schools 1-30 as "first tier schools", 31-100 as "second tier schools, and so on...</p>

<p>Keep in mind US News number ranks schools up to 199.</p>