1. Fundamentals of Software Development 1Slide 1 Gang of Four The beginnings… The original “patterns” idea was from architecture – there are repeatable patterns for doing things like design work well. I.e., “A Cape Cod house should have dormers.”The original “patterns” idea was from architecture – there are repeatable patterns for doing things like design work well. I.e., “A Cape Cod house should have dormers.” 1970-s: "A Pattern Language", by Christopher Alexander, et al., 1977 (available at amazon.com), captured such practices in a clear style, describing the circumstances and the results of a particular design practice.1970-s: "A Pattern Language", by Christopher Alexander, et al., 1977 (available at amazon.com), captured such practices in a clear style, describing the circumstances and the results of a particular design practice.

2. Fundamentals of Software Development 1Slide 2 Gang of Four From there – engineers picked it up In engineering, much of this same kind of knowledge is passed down as “best practices” and “heuristics” from more experienced to younger engineers.In engineering, much of this same kind of knowledge is passed down as “best practices” and “heuristics” from more experienced to younger engineers. They also got the idea of formalizing this guidance and analyzing it systematically.They also got the idea of formalizing this guidance and analyzing it systematically. E.g., “Build a replacement bridge right next to the old bridge. At the last minute, switch all the traffic over, from old to new.”

3. Fundamentals of Software Development 1Slide 3 Gang of Four and software people, too… 1 980-s: Hillside Group - Beck, Ward, Coplien, Grady Booch (!), Kerth, Johnson, etc. began applying pattern ideas to software. 1 980-s: Hillside Group - Beck, Ward, Coplien, Grady Booch (!), Kerth, Johnson, etc. began applying pattern ideas to software. 1995 - the famous book - Design Patterns: Elements of Reusable Object Oriented Software, by the so-called Gang of Four (GoF), that is Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides. 1995 - the famous book - Design Patterns: Elements of Reusable Object Oriented Software, by the so-called Gang of Four (GoF), that is Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides. Here they are!

4. Fundamentals of Software Development 1Slide 4 Gang of Four In this book they showed stylistically how to unleash the power of OO programming to solve very common software design problems. In this book they showed stylistically how to unleash the power of OO programming to solve very common software design problems. E.g., “Abstract Factory” – How to build a class in general, so that other classes fill in the details of that in various ways, later on. Sound a little bit like interfaces might be involved?