When a team looks exhausted, most leaders reach for the same diagnosis: too much work. The remedies follow quickly. Redistribute tasks, approve leave, send people on a time-management course. These measures are well-intentioned, and sometimes they work, but new evidence suggests they often treat the symptom, not the cause.

In a Harvard Business Review article, Gargi Sawhney and Mallory McCord (2026) reviewed six decades of research, 515 studies covering nearly 788,000 employees, on three classic sources of pressure at work: role ambiguity, role conflict, and role overload. Their conclusion is simple but powerful. These stressors behave differently, damage outcomes differently, and require different leadership responses.

Having spent more than twenty years leading projects and commercial teams across the Middle East, I recognise all three. In engineering projects, the hardest weeks are rarely the busiest ones. They are the weeks when nobody is sure who owns a decision, or when the client, the contractor, and head office each pull the team in a different direction.

Here’s what leaders should take from the research:

• Ambiguity is the silent performance killer. Of the three stressors, unclear expectations did the broadest damage: lower satisfaction, engagement, commitment, sense of fairness and even task performance. When people don’t know what good work looks like, how they’ll be judged or where their responsibility ends, even routine work becomes exhausting.
  The fix isn’t a longer job description. It’s daily clarity. At the start of every initiative, leaders should state who owns what, which priorities come first and how to escalate when things change, then revisit it in every check-in, especially during restructuring.
• Conflict drives burnout and resignations, often invisibly. Competing demands were most strongly linked with burnout, psychological distress and the intention to leave. Strikingly, they didn’t reduce task performance. High performers can keep delivering while quietly heading for the exit.
  Too many organisations push unresolved disagreements between leaders down to the people doing the work. Senior teams must make the trade-offs themselves: what comes first, what can wait and what stops. When a company rewards both speed and safety without saying which wins, its employees carry the conflict.
• Overload hurts body and mood, and engagement can hide it. Excessive workload was most closely tied to negative emotions and physical symptoms. Yet it was also associated with higher engagement, because busy people stay switched on. That makes overload deceptive: a team that looks committed may be running on empty. Time-management training can’t fix a system that keeps adding work. Leaders need the discipline to remove work by cancelling low-value meetings, pausing non-critical projects and protecting recovery time.

The practical starting point is a better conversation. In one-to-ones and pulse surveys, ask three questions. Do you know what’s expected of you? Are you receiving conflicting requests? Do you have enough time and resources? The answers reveal not only whether people are stressed, but why, and what to do about it.

None of this means eliminating every pressure. Some ambiguity is unavoidable as strategy evolves, some conflict produces better decisions, and some workload peaks come with ambitious goals. The danger lies in stressors that become chronic, and in people who lack the authority, information or resources to resolve them.

Workplace stress isn’t one problem but three, and each calls for a different response.

Wellness programmes and resilience workshops have their place, but well-being can’t be outsourced to HR. It’s designed, or neglected, in how leaders define roles, settle priorities and manage capacity.

The strongest teams are built by leaders who provide clarity before asking for commitment, resolve conflict before it reaches the front line, and have the courage to say “not now” to good ideas.

Clear roles, aligned priorities and realistic workloads aren’t soft skills. They’re the foundations of sustainable performance.