All of the CS classes I've taken (at Waterloo) have featured professors who lecture while they write on the board. On the other hand, some of the stats and fina

All of the CS classes I've taken (at Waterloo) have featured professors who lecture while they write on the board. On the other hand, some of the stats and financial math courses I've taken relied heavily on slides. I prefer no slides, personally, though my current instructor in differential equations is totally disorganized and frustrating to follow, despite using no slides at all.