Ishikawa Fishbone Analysis: Easy-to-Follow Example

The Ishikawa diagram, also known as a fishbone diagram due to its appearance, is an incredibly useful tool in problem-solving and quality control. Developed by Dr. Kaoru Ishikawa, it's particularly invaluable when performed by cross-functional teams, as it enables everyone to contribute their insights. Let's delve into the Ishikawa fishbone analysis, using a hypothetical case to illustrate.

Fishbone Diagram (Ishikawa Diagram) Explained | Root Cause Analysis Tool | Lean Six Sigma

Imagine we're a team at a manufacturing company, and we're facing a recurring issue of delay in our assembly line. We've decided to employ the Ishikawa fishbone analysis to get to the root cause of this problem.

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Causes of Delays in the Assembly Line

First, we identify the main issue - delays in our assembly line. Next, we divide potential causes into categories, with the main branches of the fishbone representing these categories.

the fishbone diagram is shown with different types of fish and other things in it

The six primary categories of the Ishikawa diagram, often remembered by the acronym DMAIC (Diagnose, Measure, Analyze, Improve, Control), will guide our analysis:

Machine (M)
Method (A)
Material (M)
Manpower (I)
Maintenance (C)

Root Cause Analysis Using Fishbone Diagram

Machine-Related Issues

Under the 'Machine' category, we identify sub-causes like equipment breakdowns, improper usage, or inadequate maintenance.

For example, our assembly line might be experiencing frequent breakdowns due to worn-out gears. This issue is now clear, and we can plan for regular gear inspections and timely replacements to prevent such breakdowns.

Methodological Flaws

Next, we look at 'Method' - Are there inefficiencies in our current processes?

Upon investigation, we discover that our current procedure has multiple steps that can be consolidated, leading to a significant reduction in assembly time. After corrective action, we monitor the situation to ensure the new method sticks.

People- and Maintenance-Related Problems

Now, let's turn our attention to 'Manpower' - recruitment and training, motivation and skill level, and 'Maintenance' - schedules and responsibilities.

Cause and Effect Diagram: Fishbone / Ishikawa Root Cause Analysis

Problem Analysis With Ishikawa Diagram - Techicy

Blank Fishbone Diagram Template and Cause and Effect Graphic Organizer

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the fishbone diagram shows how to use it for fishing and other things that can be found

Fishbone Diagram | Fishbone Template Excel | Ishikawa Fishbone

We find that our workers are undertrained, leading to slower assembly times. Additionally, maintenance schedules are erratic, causing equipment downtime. To rectify this, we plan to provide comprehensive training and adhere strictly to maintenance schedules.

With these insights, we can target specific areas for improvement, preventing delays in the future. The magnitude of this problem-solving task might appear daunting initially, but the structured approach of the Ishikawa fishbone analysis renders it highly manageable.

Therefore, whenever you find your team grappling with a stubborn issue, consider employng the Ishikawa fishbone analysis. It might just be the tool you need to get everyone on the same page and drive meaningful change.