Re: percent of small classes.
National universities often “game” the system, by having a of of small, upper level classes available, given by senior faculty who only teach one of two tiny classes. However, the majority of the required classes that a student will take will have 50-1,000 students, and those will be the majority of the classes that a student will take in their first two years, and likely as a Junior as well.
The big difference is really in those intro classes. At a LAC and at a small number of universities, intro classes are also 50 or fewer, and are taught my TT or full time, long term faculty. At many of the “top” national universities, required intro and gen-ed classes are very large, and/or are taught by adjuncts or grad students.
So yes, the English department has 25 or so 300 and 400 level courses with 2-10 students each about some really interesting topics, but only English majors will take them, and they will only take two or three. On the other hand, the intro Lit and composition courses that every student needs to take as part of their gen-ed requirements are either in classes of 300 students, or are being taught by adjuncts who may or may not be there during the next semester. The same for Bio classes, CS classes, etc. So, on the books, there are 10 large classes, and 25 small classes, but, on average, each student has taken 3-4 large classes and 1-2 small classes.
The same thing is true for biology. The intro series for bio majors, which takes up more than 1/2 of the required bio credits for bio majors are classes for 200-1,200 students.
For example, a bunch of Harvard’s first year courses have enrollments in the 100s.
It is really all a matter of size of the school. Harvard has 1,600 students in a cohort, and 6,000 or so overall, so the largest class that they have is CS50: “Introduction to Computer Science” which, in 2019, had 735 students enrolled.
A colleges like Williams, with 2,000 students, does not really have enough students who are taking any course as a requirements to have more than 100 students in a class.
So, if you compare Number of Class Sections with Undergraduates Enrolled
in the CDS between Harvard and Williams, about 10% of all of Harvard’s classes have over 50 students, While, for Williams, the percent is 2.6%. Harvard has 34 classes with over 100 students, Williams has only 1 (Harvard has 946 classes total to Williams’ 575).
All Harvard College students have to take around 12 gen-ed courses, and many overlap. I am willing to bet that those every student’s 12 gen-ed courses is mostly made up of those 34 100+ student courses with a few 50+ courses as well. A few electives and a few of the concentrations are also likely in the 100+ and the 50+ classes.
At large publics, like U Mich, UIUC, Arizona, etc., the percent of large classes is even larger, and the sizes are bigger (I TA’ed for the intro Bio sequence at UIUC, and they were anywhere between 800 and 1,200 students).
Now, for a national university, having 50% or so of one’s classes being under 50 is great. However, it is not “the same” as a liberal arts college. Most, as I wrote, have their students attending the majority of their classes with > 50 of their peers.
Students at Williams will take 9 classes as gen-ed, and only 1 class has more than 100 students, and only 16 have more than 50. So most students at Williams will never take a class with more than 100, and likely take only a couple with more than 50.
Furthermore, one should look also at subsections (labs, discussion groups, etc).
At Harvard, again, of the subsections, 22% have more than 50 students, and 10% have more than 100 students. Almost 50% have more than 20 students, and 31% have 2-9 students. At Williams, again, only 10% have 20-29 students, and 43% have 2-9 students.
Of course, at Harvard, most of those subsections are being taught be graduate TAs, while all of the subsections at Williams are being taught by faculty.
I chose Harvard, because Harvard is a wealthy college which can afford to provide the most personal, individualized undergraduate education that is possible.
So, no, National Universities do NOT provide the same level of “small class” experience that LACs do.
The main reason is that at National Universities, TT and Tenured faculty are not expected to put as much time into teaching as at LACs, even when their teaching load is nominally the same (2/2). That means that:
A. TT and tenured faculty they are more likely to get courses in their small specialization, which have low enrollment, so intro courses are piled up on a smaller number of faculty
B. For faculty who teach intro courses, it is more time and labor efficient to have these as very large courses, with a lot of the individual interactions being left to graduate student TAs. That costs the university the price of one course by a FT faculty and a few TA salaries, versus the price of three or four FT faculty courses.
C. It allows the university to dump these courses on non-TT/Tenured faculty, since these are not specialized, and most people with a PhD or even an MA/MS in the field can teach them. These cost less per hour than a TT/Tenured faculty member.
BTW, except for the replacement of TT/Tenured faculty with PT and contingent faculty, I do not see the national university model of large intro classes as being worse or better than the LAC model. Each work better for different types of student. Besides, the large intro classes are the tradeoff for access to large research labs.
However, “Small Classes” have become a selling point for private colleges (gotta justify the $50,000 tuition price tag, I guess), so they play that game of counting the number of small classes offered, rather than the number of small classes that a student actually takes.