A AshToolbox / Maintenance & Reliability Suite
Foundational Category: Root Cause & Risk • ~4 min read

Ishikawa Fishbone Diagram

Map all potential causes across Machine, Method, Material, Manpower, Measurement, and Milieu.

Q:

What are the 6M categories of an Ishikawa Fishbone Diagram?

The 6Ms structure potential causes into six distinct domains: Machine (equipment flaws), Method (procedures & SOPs), Material (raw materials, lubricants, parts), Manpower (skills, training, fatigue), Measurement (sensors, calibration), and Mother Nature / Milieu (ambient temperature, dust, vibration).

100% In-Browser Execution — Zero Server Storage.
Ishikawa 6M Diagram
PROBLEMEFFECTMachineBearing housing sealShaft angular misaliMethodAbsence of hot alignMaterialLow-viscosity syntheManpowerNew apprentice on niMeasurementUncalibrated dial inMother Nature

Add Contributing Cause
Advertisement

Cause-and-Effect Brainstorming

Invented by Kaoru Ishikawa, fishbone diagrams prevent teams from jumping to premature conclusions. By categorizing all plausible factors across the 6M framework, multi-disciplinary investigation teams ensure no blind spots are overlooked.

Engineering & Regulatory Notice: The calculations, projections, and failure models provided in this suite are for engineering estimation and educational purposes. Verify all calculations and assumptions independently before making operational, equipment replacement, safety-critical, or regulatory compliance decisions.

Recommended Next Steps in Reliability Workflow

Root Cause & Risk

5-Why Root Cause Tree

Drill past superficial symptoms to uncover systemic and management process root causes.

 Root Cause & Risk

FMEA / FMECA Risk Worksheet

Rank system failure modes by risk priority and assign mitigation actions with XLSX/PDF exports.

 Availability & Performance

Downtime Pareto & Loss Tree

Identify the 20% of failure modes generating 80% of lost production time.