In this week's column, Jeff Patton sends a reminder that software developers who neglect the practices of "iteration" and "incremental" will get caught either delivering poor quality software or delaying schedules in order to make time to iterate. We kick ourselves, or others, for not "getting [software] right up front" when we all know that the hardest part of software development is figuring out what to build. But there's hope, and it comes in the form of prototypes and frequent iterations.
XP teams have the right to do their best work. On the other hand, customers have the right to specify and pay for only the quality they need. How does one reconcile two potentially conflicting points of view? Is quality negotiable? If so, how do we go about negotiating it? This paper will explore the following questions: Is quality negotiable? How can we negotiate quality? What are internal and external quality, and are either or both negotiable? What's the XP tester's quality assurance role? How far should testers go in helping the customer define acceptance criteria?