This reminds me of CS 350...we used Nachos, here is a good walk through.

http://www.cs.duke.edu/%7Enarten/110/nachos/main/main.html

I got a good laugh from the marking scheme, I had forgot all about this:

  Normal  = (0.02*A0 0.10*A1 + 0.10*A2 + 0.13*A3) + 0.20*M + 0.45*F 
  Exam    = (0.20*M + 0.45*F ) / 0.65
  Assigns = (0.02*A0 + 0.10*A1 + 0.10*A2 + 0.13*A3 )/ 0.35

  if ( Exam < 50% ) {
    Course Grade = min (Normal, Exam)
  } else {
    Course Grade = Normal
  }

Then on the first day of class they tell you if you fail the assignments, you fail the course.

I really enjoyed taking that course, it was very interesting material.