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extraneous variables may be less of a factor so what becomes easier?

COVERT / OVERT OBSERVATIONS

what happens in a covert operation/

what must this behaviour be to avoid being unethical?

and what ahppens in overt observations?

and given what beforehand?

C/OVERT EVALUATION

fact pps don't know being watched removes?

and ensures what baout any behaviour observed?

this increases what about data?