Last year I taught an introductory course with 80 enrollments. This involved two hours of lectures a week, and four hours of tutorials (=discussion sections or whatever you Foreign People call them). I taught these all myself.
This year I am teaching an introductory course with 140 enrollments. This also involves two hours of lectures a week, but there are six tutorials and I only teach three of them. So theoretically it is a slightly lower teaching load, but there is also more marking (my tutor grades her share of the in-semester work, but I do all the exams), and more admin (managing my tutor, meetings with her, dealing with student problems, etc).
I would say the time I spend teaching this semester is probably overall the same as I did last semester.
But the pay. Oh yes, the pay.
To calculate how much money the powers that be should give me last semester, their reasoning went like this:
StyleyGeek's supervisor usually teaches this course, and she is half-time. (She job-shares with her husband). She only ever teaches two of the four tutorials, while StyleyGeek teaches all four. However, StyleyGeek's supervisor is also expected to do research and service, so teaching is only about a third of her job. So what StyleyGeek is doing is 1/3 x 1/2 of a job for half a year + two tutorials a week. So since an standard salary for new hires here is around $60,000, we'll pay her $5,000 + two tutorials a week, which works out to around $7,000.
To calculate how much money they should give me this year, their reasoning went something like this:
A full-time teaching load is officially defined as eight hours a week contact time.* StyleyGeek has 5 hours a week contact time, so we should pay her for half of a full-time load, + one extra tutorial a week. The person who teaches this big intro course never does much research and service during semester time, so let's just forget about docking her pay for that. But the semester is actually only four months long, so we should pay her 1/2 x 1/3 of a salary, + one extra tutorial = $11,000.
Working less for more money! It's not like I'm unhappy about that.
But there's a little niggling voice that keeps reminding me that while an official full-time load might be eight contact hours a week, most faculty only teach one semester out of two, and only three to four contact hours a week during the semester. So I've worked more (teaching) hours per week than anyone else in our department over the last year, having taught the two biggest courses we offer. Yet while the full-timers have drawn a salary of more than $60,000 for that time period, I will have earned just on $20,000. It's not that I don't spend time on research and service that benefits the university, either, since I need those lines on the CV pretty desperately.
No wonder it makes sense for universities to switch to a policy of All Adjuncts! All The Time!
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* I know, we have comparatively low teaching loads. Supposedly we define ourselves as a research university. There was no undergraduate teaching here at all until about thirty years ago. Many faculty are still employed on research-only positions. The fact that some of these faculty members have not published anything in the past three or four years is apparently irrelevant.