<p>Probably due to a combination of increased entrance selectivity (much lower need for remedial courses, students better prepared to handle 15 credit course loads, more students with AP credit) and higher in-state tuition costs (more incentive to finish on time to avoid extra semesters’ of tuition).</p>
<p>Probably from relations who experienced this firsthand like some of my California cousins who experienced this as STEM majors in the mid-late '80s. From their experiences…being shut out of some required major/core courses meant they graduated a semester to a semester and half late. </p>
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<p>Most kids who were admitted to UC Berkeley or UCLA were also admitted to Ivies and various elite colleges/universities. Unless they were gung-ho on California and failed to get into Stanford or Caltech…they’d usually opt for those other elite schools…especially considering the 5+ year graduation issue and better FA/scholarships. And I’m talking about the '90s…well-before the Ivies and some elite schools made their FA/scholarships more generous. </p>
<p>Not too many kids applied to other UCs because of admissions difficulty, cost, and plethora of perceived better options academically/financially (i.e. UMich, UW-Seattle, UWisc-Madison, U-Texas-Austin, UVA, UIllinois-UC, other elite universities/LACs, etc).</p>
<p>Hmmm, I do not recall seeing that problem at that time. However, the 4 year graduation rate was low because a lot of students took light course loads (12 or 13 credits average instead of the usual 15 average) because the normal course loads were “too much work”. In-state tuition was cheap enough then that many students did not have a lot of incentive to finish on time.</p>
<p>Another factor delaying graduation for many students then was having to take remedial English courses – about half of entering freshmen in the 1980s had to take them. At the time, they also did not give full credit for remedial courses (they counted as 4 credits of work in your schedule, but only 2 credits to the 120 needed for graduation).</p>