How to Use the Fishbone Diagram for Six Sigma Root Cause Analysis - By: Steve Wilheir

Six Sigma is a very structured process. The process starts with the Define phase, next comes Measure, where the Fishbone diagram is a important tool. The Fishbone is used to show a problem that is being reviewed and clearly lists what may be contributing to or causing the problem. Analyze is technically the next phase after Measure, but it really runs concurrently and needs input from several experts. The next phases of the process are Improve and Control.

During the Analysis stage, ascertain the problem precisely and patiently work thorough all the potential factors. In the beginning, make sure to identify and record the inputs for the problem. These inputs may be perceptible, unlikely or difficult to define. Keep nothing out of the scope during the initial analysis stage by leaving no stones unturned. Employ brainstorming techniques to come up with an array of factors. Some of these facts may be instinctive and obvious, while others might require the support of investigation, data and review.

Full engagement of various experts is required to pull together the list of inputs. From all the impacted processes and departments, there should be representatives in this group. After the starting of this, the potential improvements to the products, services or processes can be kicked off.

As identification of inputs occurs, the fishbone diagram develops as a result. While the look of the diagram should not be the focus, capturing all inputs is crucial. As an input is identified, additional causes could be identified. Each of these inputs and causes begin to branch from the larger bones. Throughout the process, identification may go several levels deep, which results in the shape. Each root cause is a small bone. If additional causes affect an input, it is not considered root. When working with a manufacturing environment, the following categories are frequently used:

1. Measurement - including using measuring devices from the six sigma methods to identify source causes and defects under that scope.

2. Man - one among the main categories when working in a manufacturing environment. Though other categories also contribute to the inputs to the system, man is potentially. The main source of these inputs would be from brainstorming sessions and conversations.

3. Machine - including sources generated from machines used in the environment. Determining if one or more machines generate a significant portion of defects can be beneficial for locating the defect source.

4. Method - Take this opportunity to look into the processes used in the company. Sometime an alteration in a process can cut down the amount of faults or facilitate location of the issues.

5. Material - including any raw materials or other pieces requiring quality review during the process. At times, material used in the work stream may be the cause of defects identified by the end of the manufacturing process.

6. Environment - Because many factors can have a negative effect on the process,such as external factors specifically the environment should be examined and observe very well.

About the Author

Steve Wilheir is a project manager. Learn more about fishbone analysis, the 5m fishbone diagram, and how to make a fishbone diagram to resolve your establishment's quality issues.

Article Directory Source: http://www.articlerich.com/profile/Steve-Wilheir/49161

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