Scrum is one of the most popular methodologies of flexible development. One of the reasons of its popularity is its simplicity.
In Scrum methodology Sprint lifecycle is broken down into four stages:
In Scrum the iteration is called Sprint. Its duration takes one month (30 days). Outcome of Sprint is the finished product (build) which can be transferred (delivered) to the customer
Scrum is one of the first methodologies of cyclic functionality development and correction of the project on the basis of the analysis of feedback from users.
RUP (Rational Unified Process) splits the project performance into phases each of which consists of one or several iterations.