Comment by seanmcdirmid

Doing weed out courses on purpose I think is elitist and unnecessary, but computer science does require understanding of some hard topics. Linear algebra, theoretical computer science and the like may have very high failure rates, but are a necessary pre-requisite to become a computer scientist.

Two reasons:

1. Back when I was in CS, the department was much smaller than it was today. This was after the 80s programmer crash, and so they just didn't have enough professors or resources to teach as many students as were interested in being CS majors.

2. You are able to teach to a higher standard if you've filtered the students that enter your department. You can have one or two people fail OS rather than half the class. At some point, it is reasonable to see if the students are committed, and they get to prove themselves a couple of years after high schools, which worked better for people like me who weren't very accomplished until they get to college.

Ideally people who can't handle the course should get filtered out before being accepted to the college, so they don't waste any money. But since it's impossible to filter reliable at that stage, surely it makes sense to also filter early on in the course. (from the perspective of the student. If the college wants to take more of their money they could still direct them to a different, easier/more suitable subject).

A lot of schools these days weed out at the application level: if you have a great portfolio from middle school through high school, great! You have it made.

I sort of like the change to redeem yourself during the first two years of your university if you didn't have the ideal secondary school experience to get into a hot department of a hot university. CC can do that as well, I guess, but it is a much harder hill to climb.

My university had a proof based, let's construct the natural numbers from axioms and prove that a+b == b+a type course as the first class for aspiring math majors. It was a "weed out" course, not in the sense that it was particularly hard, but more in the sense of introducing students to this is what 'real' math is actually about, and not so much the stuff you were doing in high school. Some students decided each year that they didn't want to do 'real' math and went on to focus on other things.

Yep.

At my university, after the usual calculus/diff eq/lin alg sequence everyone in STEM takes, we had “intro to advanced mathematics” that was proof based, taught in the spring, and a pre-req for everything higher level (abstract algebra, real analysis, etc). Most math programs have a similar “first proofs” class as their “weed out” class.

Math isn't popular enough to have weed out courses, and math professors of higher division classes don't mind failing half the class. There isn't much of a drawback to letting as many people who want to major in math.

But intro STEM math is used as a weed out for other majors. You aren't going to get far in CS if you aren't able to ace your basic calculus classes.

Real analysis or other similar "proofs of basic things" classes usually fill this role.