ChatDiagram
無料で試す
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.

種類 決定木規格 Howard-Raiffa / CART-sklearn / taxonomyエンジン schematex-decisiontree更新日 2026/9/24
Quality defect hypothesis tree
Drawing preview
依頼内容

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

次はこちらAdd a branch for tool wear.Change the root to a seal leak defect.
この図に含まれるもの

図の背後にある意思決定を読み解く。

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.

決定木のテンプレートをすべて見る →

よくある質問

よくある質問

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.