"Between knowledge of what really exists and ignorance of what does not exist lies the domain of opinion. It is more obscure than knowledge, but clearer than ignorance."

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Practice is a shared history of learning. Practice is conversational. 'Communities of Practice' are groups of people who share a concern (domain) or a passion for something they do and learn how to do it better (practice) as they interact regularly (community).

— Etienne Wenger