Mastering a programming paradigm requires 3 levels of expertise: rules,
principles and patterns. When it comes to OO, though, most people jump form
rules to patterns. The result is that many OO applications today have
designs that are rigid, fragile, opaque, and with lots of cut and paste.
This presentation will show how identify problematic designs, and how OO
principles can be used to produce applications that are clean, well
structured, and easy to understand and maintain.