In the opinion of the company accountant, the managers completely failed to understand what was really going on: a little-known phenomenon known as the Hawthorne effect. According to the Hawthorne effect, when you introduce an innovation is new. Managers try harder because they are dealing with a new system. Workers try harder because they are trying out something new as a team. Then, as the innovation becomes routine, results slide back to pre-innovation levels.

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The fact about this passage is that the company accountant believes that the managers failed to understand the Hawthorne effect. The Hawthorne effect is described as a phenomenon where individuals modify their behavior when they know they are being observed. It suggests that when a new innovation or system is introduced, both managers and workers tend to put in more effort initially, but over time, their performance may decline and return to previous levels.