Originally Published in Quality Magazine | May 2026

You’ve built rigorous systems for tracing defects to their source. But one upstream cause rarely makes the diagram and it’s been generating quality escapes across the industry for years.

You’ve been here before. A defect surfaces and brings a critical project to a halt. The production team goes into overdrive. Management places a microscope on every single step. The quality team runs the analysis, a corrective action gets written, and the issue closes out.

Three months later, the same cycle reemerges. Maybe a different shift or different operator, but the same cycle. Overdrive. Analysis. Correction. Complete.

Maybe you’re in one of these cycles right now. Maybe you just got out of one. Maybe you’re holding your breath until the next emergency.

Or, maybe you’re stuck fighting the wrong battle. Maybe, if you’re stuck in this cycle, you haven’t taken your root cause analysis far enough…

Before you open another fishbone or start the next RCA, it’s worth asking a different question: what’s the real quality issue at hand here?

Is it the defect in front of you? Or is it the cycle you keep finding yourself in?

The Real Defect is The Pattern

There are many useful tools in the quality professional’s kit. They’re structured and disciplined, and when applied rigorously, they reliably pull root causes to the surface across six categories: Machine, Method, Material, Measurement, Environment, and Man.

That last category is where the analysis tends to get complicated and where a critical blind spot lives.

When we hyperfocus on a specific incident or mishap, the investigation almost always terminates at the operator level. What did the operator do? What should they have done? What training is needed? Those are legitimate questions. But they’re narrow questions. They’re asking about a specific situation, and they often fail to address the role our humanity plays in the workplace.

What if we started asking deeper questions about that (or every) operator’s experience on our floors?

Do they understand what they’re doing and why, or are they just managed outputs? Are they engaged in their work, or dreading the next shift?

The supervisor sits upstream of every operator on your floor. They are the source of truth for each of these questions and more.

What a Leader Actually Does

Before we can identify a gap in frontline leadership, we need to be precise about what frontline leadership actually is.

A supervisor’s job is not simply to manage throughput and report problems upward. Their primary function is to create the conditions in which work gets done correctly, consistently, and safely. They create and communicate the plan. Set the expectations. Model the standard. How they do those things shapes, more than any other single variable on the floor, whether a team member takes ownership of their work or simply clocks in.

That’s not a soft observation. According to Gallup’s “State of the American Manager” research, managers account for at least 70% of the variance in employee engagement scores across business units. Engagement – the degree to which a person is invested in the quality and outcome of their work – is driven primarily by the supervisor. Not the process. Not the pay. Not the safety poster in the break room. The supervisor.

When that supervisor is unclear, inconsistent, or underprepared, the effect flows directly downstream. Variable supervision produces variable outcomes. In process control terms, this isn’t a special cause event. It’s a common cause condition, a systemic input generating predictable variation. And it will keep producing that variation until it’s addressed at the system level.

The Root Cause We Keep Promoting

You’ve undoubtedly seen this play out at almost every organization you’ve interfaced with in your career: the best operator gets promoted to supervisor. And it’s a rational decision on its face. They know the work, they’ve earned respect on the floor, and they perform at a high level. No one questions the decision. Keep production moving.

What happens next is where the problem begins. Knowing the work and leading the work are entirely different disciplines. The new supervisor understands the process better than anyone in the room. What they’ve never been taught is how to communicate a plan and set expectations clearly, how to empower their technicians with purpose and accountability, how to address a deviation without destroying a relationship, how to interact healthily with other teams, or how to rally the team when they’re three people short and behind on schedule.

Without that preparation, the new supervisor defaults to what they know: doing the work themselves, managing by proximity, and solving problems reactively. They’re not failing because they lack talent. They’re failing because the organization handed them a new profession without any of the guidance or infrastructure that profession demands.

According to DDI’s Global Leadership Forecast, only 25% of manufacturing leaders rate their frontline leadership quality as high, placing manufacturing last among major industries surveyed. That number reflects the cumulative consequence of a promotion culture that treats technical excellence as sufficient preparation for leadership.

The defect on your quality report is often the last event in a long chain. That chain frequently starts at the moment a great operator became an unprepared supervisor and nobody noticed because the fishbone doesn’t go that far upstream. It was never designed to.

What This Means for the Analysis

No airline takes its most experienced flight attendant and hands them a cockpit. The aviation industry treats pilot development as a system: ground school, simulation, supervised flight hours, ongoing qualification standards. Authority is granted in sequence, after demonstrated competency, with continuous reinforcement built in. The consequences of skipping that system are too obvious and too immediate to rationalize.

In manufacturing, the consequences of skipping supervisor development are also real. They’re just delayed, diffuse, and easy to misattribute. They show up as recurring quality escapes. As close calls and mishaps. As shift-to-shift inconsistency in how operators show up for and engage with their work. As disengagement and turnover.

The implication for quality professionals is direct: if the supervisor is a primary input to work quality – and they are – then supervisor preparation is a quality variable. It belongs in the analysis. When a quality escape traces to operator behavior, we cannot stop there. It should extend up the chain of management: what was the supervisory environment that allowed this condition to exist and persist, and is it isolated or systemic?

That shift in scope doesn’t require a new methodology. It requires pointing the existing one further upstream than it typically goes.

The Cause You Can Control

Quality professionals are uniquely positioned to make this argument inside their organizations because they already speak the language of root cause, upstream thinking, and prevention over reaction. The instinct to ask “why did this happen?” rather than “who do we blame?” is built into how quality teams operate. Applying that instinct to the leadership pipeline is a natural extension of the same discipline.

The defect isn’t on the floor. It’s the system that put an unprepared leader there, and that’s a root cause you can control. Organizations that treat supervisor development with the same discipline they apply to process design stop seeing the same failure patterns recur.

I was honored to author this featured article for Quality Magazine. You can read the full article here.

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