Corey Ladas has written an interesting paper titled Scrum-ban in which he describes how a Scrum team might introduce the lean practice of kanban. He goes on to describe an evolutionary process, which if taken far enough, replaces most of Scrum. Even for those who don't want to scrap Scrum and go lean, the paper provides a useful view into what kanban is and how it can augment Scrum.

http://leansoftwareengineering.com/ksse/scrum-ban/ 

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