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We just want the design to provide an implementation guidance for the story as it is written ---nothing less, nothing more. Don’t try to design extra functionality because you assume it will be required later.
Changing a software system in such a way that: 1- The internal structure is improved. 2- The external behavior is not altered (not changed). Design occurs CONTINUOUSLY as the system is constructed. Also means:
Coding Two people work together at one computer to create code for a story. This provides a mechanism for real-time problem solving and real-time quality assurance . Keeps the developers focused on the problem at hand. As pair programmers complete their work, the code they develop is integrated with the work of others.