ARC is one way to describe three possible stages of a class. It stands for Authentic Use, Restricted Use and Clarification and Focus.

ARC could be used to describe the staging of a grammar presentation lesson which starts with an explanation of rules. Here it would have a different order: CRA.

In the classroom
Authentic use might be a conversation stage that is designed to include the language that learners should practise; restricted use could be a gap-fill exercise on the language, and clarification and focus an explanation of rules on the board.

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