This role can be assumed formally - as when the teacher evaluates learners in a progress test - or informally - as when s/he responds to a learner's utterance with a "good" or a correction
Assessor (or Evaluator)
This is when the teacher is forming pairs and groups, giving and checking instructions, allotting and controlling the time allowed, making sure learners are on task and everyone is participating, etc.
Activity manager
As the course progresses the teacher will be reflecting on how successful it is.
Course evaluator
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