Com S 362 --- Object-Oriented Analysis and Design

		    EXERCISE 7: WRITING USE CASES
                 (File $Date: 2004/09/03 12:49:56 $)

The purpose of this exercise is for you to try writing use cases.

As with all exercises, this is to be done individually, not in teams.
And it is due the day this topic is planned to be discussed in class, unless
specified otherwise (see the syllabus at:
http://www.cs.iastate.edu/~cs362/syllabus.shtml). 

As with all exercises, you have two choices for doing the work. You
can either:

  - complete it as specified or
  - write down questions or problems that you had in trying to
    complete it.

If you write down questions or problems you have, these should be
detailed enough so that we can tell that you have read the materials
and thought about them.  (Don't just write: "I couldn't get it to
work; say what you tried and what you didn't understand.)  During the
class where this exercise is discussed, you should try to get help
with these by explaining what you did and what your problems or
confusions are.  Don't be shy; there will be other people with the
same problem, and everyone can learn by discussing these issues.

1. [Use Case: Buying Books Back from Customer]

Read chapter 6 of Craig Larman's book Applying UML and Patterns
(second edition, Prentice Hall PTR, Upper Saddle River, NJ, 2002).
Also, for more examples look at the web page for the StickSync project:

  http://www.cs.iastate.edu/~cs362/sticksync/usecases.shtml

Consider a point of sale system for a university book store.  Using
the brief format, write a use case titled "Buying a Book Back from
Customer", which would involve the store "book buyer" pricing and
buying back used books from a "student".  Assume that the store has a
database of prices of books, which includes prices for all books the
store cares about in various conditions, which should be consulted.

Be sure your use case is written in an essential, UI-free style (see
Larman's section 6.11).  You only need to consider the "happy path".

WHAT TO HAND IN

You should have at the beginning of class, written answers to the
above questions (or written out questions and problems you encountered
for each part).  Make sure your name is on these. Attach the
printouts, if any, requested above.

ADDITIONAL READINGS

If you have time, read chapter 3 of Martin Fowler with Kendall Scott's book
UML Distilled (Addison-Wesley Longman, Inc., Reading, MA, 2000).