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Operations · Quality

Quality defect hypothesis tree

A quality defect hypothesis tree organizes an investigation around evidence instead of opinion. It starts with the defect-rate change and splits the likely causes into materials, equipment settings, process execution and inspection. Each terminal branch says what to compare or observe next. Quality engineers can use it in a containment meeting to divide evidence-gathering work, then remove branches that do not explain the data. It works best when the root condition is stated precisely by product, lot and time period.

Tipo Árbol de decisionesNorma Howard-Raiffa / CART-sklearn / taxonomyMotor schematex-decisiontreeActualizado 24/9/2026
Quality defect hypothesis tree
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La solicitud

“Create a quality defect hypothesis tree that tests material batches, machine settings, operator steps, inspection sampling, and defect classification.”

Entonces pruebaAdd a branch for tool wear.Change the root to a seal leak defect.
Qué hay en este dibujo

Lee las decisiones que hay detrás.

01Validate the signal

Confirm classification and sampling before acting.

02Check materials

Compare affected lots with certificates and samples.

03Check settings

Align the event timeline with parameter changes.

04Check process

Observe work steps and inspection practice.

Use for an initial cross-functional investigation before selecting corrective action.

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Preguntas frecuentes

Preguntas habituales

How is this different from a fishbone diagram?

A hypothesis tree emphasizes testable claims and next evidence, while a fishbone is commonly used to list possible categories of causes.

Can several branches be true?

Yes. The purpose is to test contributors separately rather than assume one cause.

What should the root contain?

A specific observed defect change, including the affected product, rate and time period.