[marcosdumay]

Wikipedia has a surprisingly good explanation:

https://en.wikipedia.org/wiki/Kanban

There's a link to Toyota's site at the bottom, as the inventors, they have plenty of authority on it.

Wikipedia has also an article about Kanban in software development. As expected, the introduction does not even make sense, but the methodology section contains a form of continuous improvement, what could work. Also, I could not understand how any of the experiences related on the article could come from the Wiki's methodology - it has probably no relation at all with was implemented at the author's place.