In a busy office, meena records managers' behaviors when they interact with subordinates. she goes to great lengths to make sure that the managers are not aware that she is watching them. this is an example of:

Covert observation

A covert observation is a method of data collection wherein a researcher or individual observes a group of people- their interactions, behavior, mannerisms, etc.- without the knowledge of the group being studied. The group being investigated in the study is not aware that someone is conducting research on them and what the purpose of that research is. 

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