lecture 5 has too much material - separate parsing from utility functions.
NOTES for next semester (S96)

We need to cover BNF in the class!!!!

avoid using (define (fred x) .... ) and write
  (define fred (lambda (x) ....))
instead.
Make homework anticipate the class tests more.

Bound copies of the notes instead of the textbook?
Josh.D. says "the book is helpful but confusing - stick to notes or go by
book".

Explain status of book - lecture notes are definitive.

Error messages are too verbose.
Debugger needs to be more controllable.
We need tutorial sessions on how to use the debugger.
Store definition lambda-expressions with the code.

How about a discussion section.

At least two classes should be held in the lab - help familiarise student
with the debugger.

Homework problems are tougher than the book gives examples for.
Give more worked examples in the notes.