"How do you estimate on an Agile project?" by Martin Folwer and ThoughtWorks
The Agile Zone is brought to you in partnership with JetBrains. Learn how Agile Boards in YouTrack are designed to help teams plan, visualize and manage their work in an efficient manner, with support for both Scrum and Kanban processes.
If you’re interested in techniques for estimation, you should take a look at this pdf ebook. It contains half-a-dozen essays on estimating in agile projects, drawn from our experiences with a wide range of clients. We explain approaches based on story points and on story counting, which should give you a good overview for you to explore an approach that will work for you.