Ralph Johnson discusses principles, practices and tools relating to software development starting not from scratch but from already existing code which needs refactoring, maintenance, and sometimes architectural change.
Ralph Johnson is one of the four authors of the Design Patterns book. He is currently involved with the CS Department at the University of Illinois and the leader of UIUC Patterns/Software Architecture Group. He is mostly interested in OOP, especially frameworks, patterns, business objects, and Smalltalk, and researches refactoring, being involved in creating the Smalltalk Refactoring Browser.
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