Tier 1 schools are the top 25 schools of any particular category. Tier 2 schools are the next 25, and Tier 3 the next 25, and Tier 4 is the next 25. Everything else doesn't matter.
Harvard, Yale, Duke, Notre Dame, Georgetown, and Berkeley are all Tier 1 Schools.

MIT, Cal-Tech, Stanford, and Cornell are all Tier 1 Engineering schools.
by ThomKatt June 22, 2011
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