Schlitz chose the phenomenon of just turning around to discover that you were being watched from behind, which she called "covert observation."

There are obviously more ethical guidelines to take into consideration when a covert observation is being carried out.

It was kept under covert observation until the incubation period had elapsed but none of the crew fell ill.

Overt Participation Observation does not have the ethical problems of covert observation and lets the researcher watch the people lying about what they are doing.

Strict ethical guidelines must be followed when covert observation is being carried out.

Our ability to change forms makes us much more suited for covert observation than a group of twenty foot Ursars.

Starfleet uses isolation suits for the express purpose of conducting covert cultural observations of prewarp societies.

People draw the wrong conclusions or become offended or both, so I practice covert observation.

Vadim, would you be able to keep the generals under covert observation while they're in camp?

The rest she devoted to the covert observation of Twilla Gilbreath.