In the console tree of the Scrum project management process every iterations takes from 1 to 4 weeks, called Sprints (it is called iterative) short period of time, the one reason enough to release (release) feature that has been completed. There is a maximum. Use the least resources and as soon as possible to the eye you get to experiment before the whole project (this is called incremental) every Sprint must be able to release the feature products that actually works and is useful to customers, this feature until all of that to be agreed with the customer (adidas rom single with singer, artist, with the release of their single out themselves. If good, continue. If not, well, the next update or cancel the project.)