Find the focus, make your work clear.

Find a method for your next update. Make the facts, judgments and next steps clear.

How can a fishbone diagram organize possible causes?

The situation

Fictional scenario

We’ve described the quality variation. Why is it still unclear what to change?

Describing the situation does not establish the cause. Explore possibilities and check records.

I’ll organize candidates with a fishbone and investigate them; the lines are not conclusions.

What is getting in the way

A fishbone supports exploration followed by organization. Manufacturing can use people, machines, materials, methods, environment and measurement; service work may use policy, people, procedures and place. No category scheme replaces causal investigation.

Method and tool

Fishbone analysis: from candidate causes to evidence

Read the four investigation stages, then see how six manufacturing cause categories lead to one problem. Select a category for an evidence check.

REVIEW & PLANNING · CAUSE ANALYSIS

Fishbone analysis

Map possible causes, then investigate them with evidence.

01Define the problem02Explore causes03Organize candidates04Investigate & test

Collect possible causes
Do shift patterns or experience levels correspond to the defects?

Collect possible causes
Are defects concentrated on a machine or after a setup change?

Collect possible causes
Does quality differ between material batches?

Collect possible causes
Do procedural differences coincide with defects?

Collect possible causes
Do environmental changes align with the affected batches?

Collect possible causes
Does the finding reflect a product change or a measurement error?

PROBLEM TO EXPLAINOne specific problemCauses not yet confirmed

Possible causes → problem to explain

KEEP CAUSES PROVISIONAL

These six categories suit a manufacturing example and can be adapted. A connection is not proof of causation: clarify, consolidate and test candidates with evidence.

Select a cause category for an evidence check.

Apply it to your own work

Copy the prompt and add your material to prepare a draft you can adapt.

View prompt

Use “Fishbone analysis: from candidate causes to evidence” with only the material I provide.
Return a problem definition, categorized candidate causes and an evidence plan for each. Do not present untested candidates as root causes or the diagram as causal evidence.

Use this structure:
1. Define the problem: Specify the object, symptom, period and comparison without embedding an assumed cause.
2. Explore causes: Gather candidates by task-relevant categories, adding subbranches when useful.
3. Organize candidates: Clarify vague items and consolidate duplicates, separating hypotheses from evidence.
4. Investigate & test: Prioritize evidence gathering, compare records or tests, then assess causes.

Separate facts, interpretations, forecasts, proposals and approvals. Mark missing information “To confirm”. Do not invent figures, causes, owners, dates or agreement. Keep units, periods and conditions. Do not treat the fictional example as my evidence.

My material:
[Paste the context, records, constraints and response needed, with sensitive information removed.]

Find the focus, make your work clear.

How can a fishbone diagram organize possible causes?

The situation

Fishbone analysis: from candidate causes to evidence

Fishbone analysis

People

Machines

Materials

Methods

Environment

Measurement

Apply it to your own work