Thanks!
(begin 777 ob-SCEA)
In the Class Diagram, I didn't show much diversity or imagination, which is probably why it was the lowest scoring. It was just basically a rearranged version of the business model with a few more things like user and credit card tacked on.
I made 5 Sequence Diagrams. I didn't really understand how the lifeline box things in UML really worked, so I arranged them any which way. I thought they looked relatively simple, in terms of the number of objects across and the number of arrows going down (if anyone's interested, I can dig up my assignment and get my average number for these).
The Component Diagram I made was a mess. I could only look in puzzlement at what I had drawn. Since I couldn't figure it out, I figured it was too hard to fix, so I just submitted it as it was.
I used Visio 2002 for all the diagrams.
(Please forgive some off topic stuff that follows)
Simon, regarding the Oracle exams, I'm very impressed that you are continuing to work on your certification even after failing twice! For this discussion, I'm assuming we're talking about the DBA track. The two exams I took were quite challenging. I used the Oracle Press OCP books for the corresponding exams to study. For Exam 1, Introduction to Oracle9i SQL, I read through the book rapidly twice before taking the exam. I also downloaded Oracle 9i Enterprise Edition from Oracle, a 1.2 gigabyte download over a 56k modem connection. During the exam, which is unproctored, I had the reference book and SQL*Plus running and ready to verify simple syntax questions [my lawyer's interpretation of Oracle's rules that you were permitted to have "reference materials" of your choice for this exam.

] I passed with a grade that was not outstanding, but which gave a comfortable margin.
I sensed that Exam 2, Oracle 9i Fundamentals I would be more challenging, so I prepared more carefully, actually reading the exam book carefully - twice, and doing two of the three practice exams in the back. I got about 80% on those. I thought I was quite ready. But when I took the actual exam, I was stunned by the questions, which asked you to do things like choose 3 out of 5 answers, or 4 out of 7, or 2 out of 4, and everything in between, and it was a mess. I barely passed. Nevertheless, so far, the Oracle Press OCP books have been excellent study materials, and I used them exclusively to study.
It doesn't seem to be possible yet to get the OCP 9i DBA certification directly yet, because Oracle still hasn't released Exam 4.