I'm currently the Scrum Master of a 10 developer strong team. We've adopted Agile/Scrum methodologies for some time now and are currently on our 53rd Sprint. Our stakeholders actively like to understand the output of story points in advance of a Sprint. This is currently done on a capacity basis working on a focus factor of 60%.

Choosing the right iteration length is an important decision. These are important factors you should consider when selecting your team's iteration length.