We will be looking for code that follows sound object-oriented design
principles and conforms to these criteria:

Classes/Interfaces
  * Correct types on fields
  * No missing fields
  * Each class has a defined constructor (don't rely on a default constructor)
  * Constructor is logically correct
  * Correct choice between using interfaces/abstract classes (after HW1)

Examples of Data
  * Examples for all types of data (not just simple examples)

Methods
  * Every method documented with a purpose
  * Types of arguments and return values are correct
  * Logic is correct
  * Method names are consistent across variants of the same type

Test Cases
  * Adequate set of test cases provided for each method
  * Each test case commented with explanation of what is being tested

Program Structure
  * Duplicate code/fields abstracted where appropriate/possible (after HW1)
  * File formatted in a way that is readable  
    (consistent indentation)
  * Program uses only those constructs approved for the assignment

OO Programming Issues
  * Program relies on dynamic dispatch 
    (does not do explicit type-checking of objects)