Action research vs. ethnography?

Can someone explain me (or point to something) differences between action research and ethnography?

My feeling that the differences should be somewhere around:

• role of action (~action as intentional/explicit goal of action research)
• process (cycles in action research)
• data collection/documenting focus
• …

Archived version of this entry is available at http://blog.mathemagenic.com/2005/04/08.html#a1540; comments are here.

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Tagged as: action research, citedCh2, ethnography