The most recent count of completed story points in an iteration is the team's velocity. The number of story points
completed in an iteration will change over time. Consequently, the team's velocity also changes. If the team's velocity
increases, more work can be done in each iteration. If the team's velocity decreases, less work can be done in each
As the team progresses through the project, the team's understanding of the problem is improved. Customers will add new
stories and remove others. Programmers may need to change story estimates. Consequently, the release plan should be
revisited periodically (every few iterations or as needed).