Editing Agile software development (section)

===Quality focus===
[[File:Pair programming 1.jpg|thumb|right|[[Pair programming]], an agile development technique used in [[Extreme Programming|XP]]]]
Specific tools and techniques, such as [[continuous integration]], automated [[unit testing]], [[pair programming]], [[test-driven development]], [[Software design pattern|design patterns]], [[behavior-driven development]], [[domain-driven design]], [[code refactoring]] and other techniques are often used to improve quality and enhance product development agility.<ref>{{cite book|last1=Jeffries|first1=Ron|last2=Anderson|first2=Ann|last3=Hendrickson|first3=Chet|title=Extreme Programming installed|date=2001|publisher=Addison-Weslsy|isbn=978-0201-70842-4|pages=[https://archive.org/details/extremeprogrammi00jeff/page/72 72–147]|url=https://archive.org/details/extremeprogrammi00jeff/page/72}}</ref> This is predicated on designing and building quality in from the beginning and being able to demonstrate software for customers at any point, or at least at the end of every iteration.<ref>{{cite book|title=Agile Testing: A Practical Guide for Testers and Agile Teams|author=Lisa Crispin|author2=Janet Gregory|publisher=Addison-Wesley|year=2009}}</ref>