![]() ![]() Open windows allow wind to blow over tables and standsĪ fishbone diagram is a simple yet powerful way to brainstorm potential causes of problems and how they interact.Hole in roof lets rainwater fall onto material racks.Air conditioning vent blows on gauge, altering reading.Here you might find problems in areas such as: Problems in the plant that prevent consistent environmental conditions could be the source of your troubles. For example, you might consider environmental temperature, humidity or pressure when searching for a root cause. This category is for relevant external factors at different points in the production process, including storage and the work area itself. Part number called out does not match part number being used. ![]() Potential factors in this category include: In this area of the fishbone, you review every material that goes into a process to weigh its potential impact. Whether raw materials or inspection materials such as soapy water sprayed on a tire to detect leaks, anything added during a process can impact quality. This category captures the materials involved in a given process. You might include information on scales, vision systems or human inspectors here, as well as sub-causes such as: This category of the fishbone diagram captures any techniques used to measure whether a part or process meets the desired quality standards. Instructions didn’t plan for this defect.Look at whether the instructions accurately describe the process, if they prevent a defect from occurring or even whether a picture is clear enough. Here is where you would review any instructions used during the process being evaluated. This category is for process documents and instructions. Preventative maintenance schedule not followed.Some examples of causes in this category are: Depending on the process, this category could capture anything from pouring robots in a foundry to printers in a book shop. This category is for all elements related to the machines used in a process. Potential causes in this category include: Operators are the most common group in this category, but it can also include maintenance teams, quality control specialists and supervisors. This category is for anything related to the people associated with the process. For a great example, see the American Society for Quality (ASQ) glossary entry on fishbone diagrams. ![]() It’s worth noting that each category may also have various sub-causes as well. Under each category is where you add elements that could impact the process associated with that cause. While the categories can change, the most commonly used are: Each of the bones feeding into the spine of the fish represents a specific category of potential contributors to the problem. Over time, it was nicknamed the fishbone diagram due to its resemblance to a fish skeleton laid on its side. It is considered part of The Basic Seven tools of quality control today. Popularized in the 1960s, the Ishikawa diagram was used as a basic tool of quality control by Kaoru Ishikawa at the University of Tokyo. ![]() Easily create, customize, and present your own fishbone diagram with our free downloadable set of templates!Ī fishbone diagram, also called an Ishikawa diagram, is a visual method for root cause analysis that organizes cause-and-effect relationships into categories.Here we look at the basics of how a fishbone diagram works, as well as some examples of how to apply it in your facility. Using this method allows you to visualize and organize potential causes of a problem into a useable framework for solving it. One visual method of root cause analysis that helps do just that is the fishbone diagram. However, without a way to organize the information visually, it can be hard to see how different facets of the problem interact. When tasked with solving a problem, brainstorming potential causes is a good place to start. ![]()
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