The software development methodology where in order to lighten the modification risk of user request and specification, it seriously considers the communication between the customer and the developer, codingandtest and ???????? (rewriting the cord/code) puts emphasis, release of period keeps advancing development shortly over again.Agile software developmentor light weight (???????) typical one among the consecutive techniques which are named generically development.

Ward ????? (Ward Cunningham), Kent Beck (Kent Beck), remaining overnight ?????? (Ron Jeffries) 3 people being center, it formulates and being something which lectures, Beck wrote in 1999, attention was attracted "Extream Programming Explained - with Embrace Change".

WaterfallmodelandRUP process of development (procedure) are something which is decided, but the methodology as it is called in XP is made "rule of conduct" and the application. XP was the core "4 values" and, "the practice of 19" in order to practice (at the beginning 12, but revision repeatedly is) has stipulated set.