Ask what makes a leader's judgement trustworthy and you'll hear vague answers: wisdom, instinct, grey hair. The working definition is sharper — judgement is skills multiplied by experience. Multiplied, not added: each ingredient without the other produces a characteristic and predictable failure. And because the two failures look nothing alike, they need opposite development responses — which is exactly what most development plans, built on a single default remedy, fail to provide.
Two ingredients that don't substitute for each other
Skills are the analytic equipment — the frameworks, the training, the tools for thinking about a situation in a structured way. Experience is time in the field of practice: enough live situations, with real consequences, to know what the frameworks feel like when they meet reality. The multiplication matters because a near-zero on either side collapses the product. A person can be highly trained and still exercise poor judgement; a person can have decades in the job and still exercise poor judgement. The two failure modes just point in different directions.
- Skills without experience produces academic judgement. The person can analyse the situation impeccably and still misread it, because they've never felt how the analysis plays out with real people, real constraints and real timing. Their conclusions are defensible on paper and brittle in the field.
- Experience without skills produces narrow judgement. The person's read is based entirely on what they have personally seen — with no analytic tools to test it against best practice or to handle the situation that sits outside their history. Their conclusions feel authoritative and are quietly limited to the past they happen to have had.
The trained-but-green misread the situation. The experienced-but-untooled repeat it.
Diagnose the gap before prescribing the remedy
The practical value of the equation is that it turns "needs better judgement" — useless feedback — into a diagnosable gap with a specific remedy. The skilled-but-green person doesn't need another course; they need deliberate time in the field of practice: real decisions with real consequences, sized so that a misjudgement teaches rather than destroys, with a debrief that connects what happened back to the frameworks. The experienced-but-untooled person needs the opposite: analytic tools and structured ways of thinking that let them interrogate their own pattern-matching — because their next situation may only resemble their last one on the surface.
Most organisations run a single default remedy — usually training — regardless of which gap is present. That's how you get the veteran supervisor sitting through their fourth leadership program while what they actually lack is a structured way to test their assumptions, and the sharp graduate given yet another qualification while what they actually lack is two years of decisions that counted.
The promotion test
The equation earns its keep hardest at promotion time, because the two halves masquerade as each other. Confidence reads as judgement, and the experienced candidate is usually the more confident one — but confidence built purely on experience is exactly the narrow judgement the equation warns about. Fluency also reads as judgement, and the trained candidate can talk about the role impressively — but fluency without field time is the academic failure mode waiting for its first contact with reality. The honest question for any candidate is not "do they seem sound?" but "where has each ingredient actually come from — what training, applied in what field of practice, with what consequences?" A gap on either side isn't a reason not to promote. It's a development plan with its content already written.