Scrum gets more and more common as an agile method for the management of projects. This article is for those who want to use the model of Scrum successfully. They should first take a closer look at the description of the three roles and not mistake the Scrum Master with a Team Leader.
http://www.devagile.com/modules/news/article.php?storyid=478
Agile, Lean and Scrum 
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