<p>Welcome to Columbia! Like Garland, I'll answer based on my son's first year experience. </p>
<p>First, the TAs who teach university writing and lit hum are more like what some institutions call teaching fellows than TAs. They are at least fifth or sixth year grad students, they get training from the core office, and they are offered weekly lectures on the texts they will be teaching with suggestions for what questions they might raise. The university does take the core seriously and try to keep some standard though, of course, there can always be a dud. My son's Lit Hum teacher taught university writing first, and she has been just wonderful. She meets as frequently with the students individually as they want, writes long and thoughtful comments on papers, and he says she is also great at leading class discussion. It's his favorite class and fully lives up to his high expectations for a core experience.</p>
<p>Frontiers of Science is a lecture class with sections, some led by profs and some by post-docs who were hired to teach this class. Lectures are by the top people in their fields. Son liked the lectures, deeply disliked his section mostly because he is a science kid and found the homework and sections more like busywork. (They've taken on a huge and perhaps impossible challenge, to craft a course for both science majors and science-phobic students). University Writing is capped at 12 students and taught only by grad students in English and Comparative Lit, I believe. Since these are students in one of the top departments in the country, so they are extremely smart. They follow a unified curriculum of assignments, which the students gripe about, but it seems like a well-designed writing class and his teacher seems good and conscientious. She offered to meet with him at her apartment during Spring Break when a family emergency forced him to get an extension and turn in a paper late. I won't say he loves it, but he does admit he is learning something about writing.</p>
<p>There is no choice of core instructors, and it is very difficult to switch out unless there is a scheduling conflict. However, students do sometimes switch at the end of a semester if they really hate their section. Also, once you're in to such things as Music Hum, Art Hum, etc, which you have four years to squeeze in, you can sign up every semester and drop the class until you get an instructor you like.</p>
<p>As for other class sizes, you can go online to the bulletin of classes and look up classes by department. You'll see the actual enrollments. Son's introductory physics and econ classes are large lectures (100-200-300) that break into sections. The first physics prof was a fantastic lecturer as is the current econ prof. His math class has 40-50, taught by prof with a section led by TA. He's in a music ensemble that counts as a class (6 students and professional musician), University Writing (12) and Lit Hum (22). So, a wide range of class sizes that I believe is pretty typical. First semester he signed up for but dropped a history class that had about 25, I think.</p>
<p>The online review of profs that you can find, called CULPA, helps students avoid or gravitate towards certain professors and classes. The reviews, of course, tend to the extremes: avoid this professor like the plague, or this professor changed my life. But it is useful. And, though there are nasty reviews I'm impressed by how many students have really wonderful things to say about their professors.</p>
<p>As to how interested profs are in undergrads, first year is probably too early to tell. My son hasn't gone to any office hours that I know of, except for meeting with his LitHum instructor to bounce ideas before writing a paper. He did go to dinner at the faculty club with a small group of students and his math prof, under a program Columbia has. I actually think he found it awkward and decided maybe he'd rather wait until he is further along in deciding what he wants to do before seeking professors out! (That's just the way he is.) Anyway, I believe he's getting a great education. </p>
<p>And, you can take more than 10 classes a year. Son took six first semester (counting music and PE) and six this semester (counting music). He is working his butt off this semester, because all five of his academic classes are heavy duty. But he thought he could have added more the first semester. Columbia students tend to be gluttons for punishment -- or education -- depending on how you look at it.</p>