Fragment Name: Refactoring
	Originating Method: XP
	Definition: "A change made to the internal structure of software to make it easier to understand and cheaper to modify without changing its observable behavior"  [Fowler, M. (2000). Refactoring: Improving the Design of Existing Code. Addison-Wesley, Read- ing
	Description: improving code without changing its function.
	Method Fragment: Refactoring
	Contributes to
	Major Softgoal	sub softgoal	Cont. Value from Fragment	Study	Situation
	Improve productivity	Improve productivity during code-writing iterations	++		Productivity of iteration immediately following a refactoring shows significant bump.
			-		Non-trivial refactorings are risky and time-consuming
			-		more difficult and time-consuming than expected
	Improve code quality	Improve understanding of code	+
		Reduce complexity of code	+		the method that began with the most lines of code showed the most improvement after refactoring.
			++		replace code that works with code that works better, faster or costs less to release
			+
		Estimate/target improvement gain	++		able to make a correspondence between refactoring type and attributes that influence external quality
	Increase ad hoc code reusability	Improve code quality	++	S76	Code reusability measured indirectly by measuring quality indicators