<p>They all have restrictions by major so be sure to check.</p>
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<p>Yes, that is likely the main reason for late graduation at many schools, although class unavailability is a problem at some schools (at least one poster here mentions it at CSU Sacramento, while others mention it for community colleges).</p>
<p>Also, the schools making the “4 year graduation guarantees” are likely the ones which have the least problem of insufficient class space availability, even though some have very low 4 year graduation rates (e.g. 6% at Boise State).</p>