1. Work in short, fixed-duration iterations

A Scrum project operates in the form of iterations of fixed duration that follow one another. During each iteration, a new part of the product is developed and added to the existing product. At the end of each iteration, the product is shown to users and project managers. Feedback and requirements are taken into account to define the next evolutions. The process is repeated until the entire product has been developed.

What characterizes an agile process, whatever the method, is the ability to adapt: to a changing economic context, to changing needs, to a new customer, to technical difficulties. The key to the approach that underpins the process lies in this ability to adapt. This is achieved in particular through short iterations of fixed duration:

• customers who can only ask for what fits into one iteration are forced...