American workers are under pressure. But while conversations about burnout tend to focus on heavy workloads, demanding bosses, or the creep of always-on culture, new research points to a more insidious culprit: not knowing what your job actually requires.

A sweeping meta-analysis published in the Journal of Vocational Behavior by researchers from Auburn University, Old Dominion University, and the University of Illinois Urbana-Champaign synthesized 515 studies spanning six decades and nearly 800,000 workers.

Its conclusion?

Of the three foundational workplace stressors, role ambiguity, meaning unclear expectations around what an employee is supposed to do, is by far the most damaging.

“We often think of role overload as a detrimental stressor,” said Gargi Sawhney, lead author of the study and associate professor of psychological sciences at Auburn University. “But what we found was that role ambiguity, not having enough clarity about your work, was the most detrimental outcome for most of the outcomes we studied.”

The stressor doing the most harm

The study examined three role stressors that appear across every industry and job type. Role overload refers to having too much to do. Role conflict involves competing or contradictory demands, such as receiving conflicting direction from supervisors. Role ambiguity is the absence of clarity about what an employee is actually expected to do.

Sawhney says the goal was to understand not only how these stressors harm employees but also what causes them in the first place.

“We wanted to examine not just how they’re detrimental, but what are the antecedents of these stressors, how they come into being,” she said. “It took us upwards of seven years to get to the finish line, but we were able to provide a more holistic picture.”

The findings reveal a clear hierarchy. Role ambiguity alone is responsible for 69.7% of the drop in work engagement, and 80.7% of the decline in task performance. This means when employees don’t understand what is expected of them, their willingness to show up, engage, and perform drops sharply.

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