Second Programming Assignment

	For this assignment, all you need to do is complete the design. 
You do not have to do any programming at all.  The design must be complete,
however according to either the Abbott noun method or the Data Collection
method.  

	Do a design for the following problem:
We want a program to teach arithmetic to young children.  This program 
tests addition, subtraction, multiplication, and division in six levels.
At level 1, only addition of two single digit numbers with a sum of one
digit is used.  At level 2, we do addition of any two single digit numbers.
At level 3, we do subtraction of single digit numbers that yield a 
non-negative result.  At level 4, we do addition and subtraction of two 
digit numbers with a non-negative one or two digit result.  At level 5,
we do multiplication of single digit numbers.  At level 6, we do 
multiplication and division of single digit numbers.

	The program gives a user two tries on each problem.  If a problem 
is answered correctly on the first try, the program shows one of 
twenty simple animations.  A user completes a level when that user 
successfully answers five problems in a row.  When a level is completed,
the program gives the user a choice of two activities:
	1.  a simple race game in which the mouse is used to control a 
		car moving around a race track.  Each time the car 
		crashes the user has to start again at the beginning of 
		the track;
	2.  a dressing game in which the user may select from different 
		outfit parts ( shoes, stockings, dress or skirt or pants,
		blouse or sweater or t-shirt ) to place on a Barbie-like
		two-dimensional figure of a doll.
The user may elect not to do either game as well.

	The program creates problems by using random numbers.  

	The program should be able to support up to five different users,
but only one at any session.  The program should save a record of 
student progress for each user.  Hence the program will have to ask a 
user to identify himself or herself before starting a session with the
program.  Sessions may be suspended at any point and resumed later.

	Grading for This Assignment:
1.  Design includes Interaction Diagrams, CRC-like cards for each class,
 scenarios, Class Structure diagram.			20 points

2.  Design is object-oriented.  Each class does one task.	20

3.  Design scenarios are complete			20 points

4.  Interaction Diagrams are complete			20 points

5.  CRC cards are complete				20 points