Cause and Effect Final - IHI
Process Analysis Tools
Cause and Effect Diagram
A common challenge for improvement teams is determining what changes they can test to improve a process or a problem. Learning more about the causes of the effect the team is trying to influence is an important step toward developing ideas for improvement.
A cause and effect diagram, also known as an Ishikawa or "fishbone" diagram, is a graphic tool that helps people explore the possible causes of a certain effect. The classic fishbone diagram asks teams to list and group causes under the categories of Materials, Methods, Equipment, Environment, and People.
The process of categorizing potential causes allows teams to break down a complex problem and focus on different aspects of it. A cause and effect diagram has a variety of benefits:
? It helps teams understand that there are many causes that contribute to an effect. ? It graphically displays the relationship of the causes to the effect and to each other. ? It helps to identify areas for improvement.
Directions
? Write the effect in a box on the right-hand side of the page. ? Draw a horizontal line to the left of the effect. ? Decide on the categories of causes for the effect. Useful categories of causes in a classic
fishbone diagram include Materials, Methods, Equipment, Environment, and People. Another way to think of categories is in terms of causes at each major step in the process. ? Draw diagonal lines above and below the horizontal line (these are the "fishbones"), and label them with the categories you have chosen. ? Generate a list of causes for each category, and draw branch bones off of the fishbones to connect the causes to their respective categories. ? Develop the causes by asking "Why?" until you have reached a useful level of detail -- that is, when the cause is specific enough to be able to test a change and measure its effects.
Copyright ? 2016 Institute for Healthcare Improvement (IHI). All rights reserved. IHI welcomes the use of this tool, found at . Language, field names, and the IHI logo and copyright language must remain intact. Using this form does not imply IHI endorsement. This form may not be reproduced for commercial use without the written permission of IHI.
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Copyright ? 2016 Institute for Healthcare Improvement (IHI). All rights reserved. IHI welcomes the use of this tool, found at . Language, field names, and the IHI logo and copyright language must remain intact. Using this form does not imply IHI endorsement. This form may not be reproduced for commercial use without the written permission of IHI.
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