Session 16

* For the first half of todays session we continued with the Chapter 11 project.
* Then we went over the relationships between the various classes in the project.

* A parent/child relationship exists between Student and OnCampusStudent.
* Student is the parent (or the base class) and OnCampusStudent is the child.
* OnCampusStudent inherits from Student.

* StudentCostsFile has an association only with Student and OnCampusStudent.

* In the Student class, the variables are declared with the keyword Protected.
* This means they can be seen by its subclasses.

* The chapter also talks about three tiers within the project:
1. The Presentation Tier: The interface.
2. The Persistence Tier: The data that you keep.
3. The Business Tier: Where all the main processing gets done.