The easiest way to deliver quickly is to deliver less. There is a kind of mathematical simplicity to that statement. Short iterations are a reflection of this principle: pick one thing to do, finish it, release it, then move to the next thing. The assertion agile makes is that you’ll go faster over time by continuing to work in small batches. The rhythm of the iteration is the same each time: take a small piece of work, finish it, integrate and release, then start over.