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Fishbone Diagram Essay

2745 words - 11 pages

Data Analysis Core Competencies

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Data Analysis Techniques Descriptive Statistics Inf erential Statistics Graphing Data Aff inity Diagram Delphi Technique

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EMRA, 1998

Fishbone (Cause-and-Effect)Diagram
Force Field Analysis Pareto Diagram

PART 4 : Data Analys is Core Com petenc ies

Section 21:

Fis hbone (Cause-a nd-Effect) Diagram

Steps a nd Proce dures
1 Assemble a Team to Carry Out the Diagramming Process



Figure 1: Basic Structure of a Fishbone Diagram Figure 2: Categorical Patterns for a T ypical Production Process


Purposes of Fishbone Diagram Advantages and Limitations of ...view middle of the document...

1: Basic Structure of a Fishbone Diagram

Cause (factors)


Figure 21.2: Categorical Patterns for a Typical Production Process



Env ironment

Too much scrap in production



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EMRA, 1998

PART 4: Data Analysis Core Competencies

Intr oduction
The Fishbone Diagram is an easy to use and effective cause-and-effect technique developed by Kaoru Ishikawa (1982). It is also referred to as an “Isikawa diagram” or a “characteristics diagram”, referring to its use in identifying the causes of various quality characteristics, including problems (Ozeki & Asaka, 1990). The late Dr. Ishikawa was a quality expert who used this diagramming strategy to help Japanese business personnel in organizing those factors that influence a business or manufacturing process. The diagram has a cause side and an effect -- problem or opportunity -- side. It graphically represents the causes of a related need or problem. On the effect side of the diagram, the effect under analysis can be either a current work problem that needs to be corrected or a desired quality characteristic. On the cause side of the diagram are the factors that influence the stated effect or characteristic. Categorical examples of some of the cause factors are equipment, people, environment, materials, and procedures. The strength of the technique lies in using a diagram to analyze causal relationships in structured ways focusing attention beyond symptoms to root, or primary, causes (Swanson, 1995).

Figure 21.1 shows the basic structure of a Fishbone Diagram.

Figure 21.2 shows a Fishbone Diagram with standard categorical patterns for a typical production process.

Purposes of Fis hbone Diagram
The Fishbone Diagram technique was originally developed for analyzing the factors that influence the process of developing quality products. However, it can be used as a tool for analyzing information related to a needs analysis and selecting alternative interventions for performance improvement. Used in these ways, the Fishbone Diagram will help to generate ideas about the possible causes of problems and identify the components in the process that are responsible for the existing problems. It can also be used to plan new processe s to meet quality improvement initiatives or new business opportunities. Typically you will see a Fishbone Diagram used in the following ways:
A Fishbone Diagram is a useful method for clarifying the causes of a problem.

To identify major or minor reasons for a specific problem of performance. To identify root causes, or key drivers, contributing to some effect or measurable outcome (a performance indicator). To identify key causes for which additional data are required (Swanson, 1995).
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EMRA, 1998

PART 4: Data Analysis Core Competencies



Figure 21.3:...

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