http://netpub.cstudies.ubc.ca/mccurley/fmx3/

ActionScript for Flash MX: The Definitive Guide
Objects and Classes
Pages 274 – 292
- Class
- A self-contained description of a set of services and properties.
- List the services they provide without sharing the internal workings.
- Objects
- What we actually use.
- Described by the class.
- Encapsulation
- Hiding the details.
- Polymorphism
- Exhibit similar features.
- Inheritance
- Avoid reinventing the wheel.