>> "Crash course" is an improper term to describe a regular
>> university lecture, I think.

> Actually it is .....

Yes, improper that is.

> If their whole study had been about OS-design they would (could) have come
> out as experts. With single (half year ?) lecture they only learned what to they
> need to learn to design an OS.

I never said that their attendance of one (or more) OS design lecture(s) made them experts on that topic. I merely objected to the usage of the term "crash course" as that clearly doesn't fit into the concept of university lectures at all. On the one hand you have one (or more) basic lecture(s) on certain topics and on the other hand advanced lectures which build upon these basic lectures and go deeper into different sub-topics. I have still no idea how an alleged "crash course" at a university would relate to that.