When you follow an Agile software development methodology,
you must create and schedule your iterations, and plan work items
for each iteration.
Managing iteration schedules
If you are following an Agile or iterative development
model, you must create the expected schedule for the iteration by
specifying the expected dates and duration. The iteration dates and
duration are not rolled up from the work items that are assigned to
the iteration. The planned dates and duration are the same as the
expected dates and the duration, and are not rolled up from the planned
schedule of the work items assigned to the iteration. You can continue
to edit the expected schedule for an iteration at any time, even after
a planned schedule with assignments is created.
Planning work for iterations
If you are following an Agile or iterative development
model, you can assign work items to iterations. After you create iterations
and work items, assign the work items to iterations by modifying the Planned
for field in the Details view, or by dragging work items
to iterations.
Setting an iteration as current
You can mark an iteration as the current iteration. In
the WBS tree, the iteration icon is modified with a current indicator.