Well, they know beforehand than they are evaluated for an interview... It's a bit like psychological or sociological studies. All the time, for ethics reasons,

Well, they know beforehand than they are evaluated for an interview... It's a bit like psychological or sociological studies. All the time, for ethics reasons, the researchers must tell the subjects than they are part of a psychological or sociological test. But, the test is generally not exactly what is said to the people. For example by testing something hidden or by using actors. See for example the Asch conformity experiments or the Cognitive Dissonance Experiment. https://en.wikipedia.org/wiki/Asch_conformity_experiments https://en.wikipedia.org/wiki/Asch_conformity_experiments https://explorable.com/cognitive-dissonance-experiment https://explorable.com/cognitive-dissonance-experiment In this case the people where told than they where tested, no surprise here... That said, is it really ethic to trick people by telling them than they are tested on "something" but in reality testing them on something else ?