Fishbone analysis
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Fishbone analysis, also known as cause-and-effect diagram or Ishikawa diagram, is a tool used to identify and organize potential causes for a particular problem or effect. It was created by Kaoru Ishikawa to show the causes of a specific event. To conduct a fishbone analysis, a team agrees on a problem, writes it in a box, and draws lines extending from it to categorize potential causes under generic headings like materials, methods, measurements, people, machines, and environment. An example fishbone diagram analyzes potential causes for dough wastage in a bakery under these categories.
Fishbone analysis
- 1. Fishbone Analysis: Cause and Effect Diagram By: Tarun Yadav, B.Tech, Food Technology and Management, NIFTEM
- 2. Introduction Fishbone Analysis: • The best way of solving a problem is that first understand the problem properly. Understanding a problem includes understanding its root causes, which is very important in order to solve any problem completely. • Therefore, different management tools can be used to find out and understanding the problem and its causes. One of the popular management tool is Fishbone analysis of the problem. • Fishbone analysis is also know as Cause-Effect diagram or Ishikawa Diagram. • It was first created by Kaoru Ishikawa (1968) and used for showing the causes of a particular event.
- 3. Use of Fishbone Analysis • Fishbone analysis can be used : 1. While identifying a problem, 2. When a team thinking tends to fall into ruts. 3. While discussing and presenting the problem and its causes with others ( team discussion). 4. While finding out the root causes of a particular problem.
- 4. How to conduct Fishbone analysis • Find out a problem on which all the team member agrees. • Write the problem on the right hand center of the paper or board. And draw a box around it. • Now draw a horizontal line that goes straight into the problem box. • Draw vertically slanted lines across the horizontal line and write down the heading of the problem causes. Generally all the causes are divided under the generic headings.
- 5. • Conduct a brain storming exercise among the team members to find out the possible causes of the problem. • Then divide all the problems under the heading written on the slanted lines as the subheadings. • Write down all the causes under the headings. A problem can be written down in more then once if it lies under more than one heading. • At last try to find out the solution, which may be implied to solve the problem or its causes.
- 6. Generic headings which are generally used : 1. Manpower(people) 2. Machine 3. Material 4. Method 5. Measurement 6. Environment Example: Fishbone analysis for
- 7. • Example: Lets take an example of a bakery industry. Fishbone analysis is used here to find out the possible causes which may be related to the dough wastage in the bakery industry. By conducting Brain storming exercise among his team, a manager gets the below given points which may be the possible causes of the dough wastage.
- 8. Dough wastage Manpower Machine Method Material Measurement Environment 1.Unskilled Operator 2. New/untrained Labor 3. Improper Maintenance 3. Damaged molder 1.Faulty mixer 2. Damaged Rotary knife 6. Improper alignment of belts. 5.Improper machine sealing 4. Faulty Valves 3. Wrong calibration method 2. SOP and procedures not followed 1.Improper /wrong measuring method 1. Wrong measuring method 3. Different ingredients 2. Water 1.Different material supplier 2. Faulty load cells 3. Improperly calibrated Tools 1. Surrounding moisture 2. Room temperature 3. Outside climate