Problem trees

gears

Overview [KS – do we need this? – there are others where they have different names, but we’ve not has a separate page for them]  Also known as The tool Why use it When to use it How to use it Strengths Weaknesses Similar to Tree diagram Use in conjunction with Complemented by Example(s) Additional […]

Identifying root causes

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Preparing for service design Discover Define Develop Deliver Follow-up   Cause and effect analysis Fishikawa Pareto analysis Problem trees Tree diagram Cause and effect analysis Fishikawa Five Whys Problem trees Tree diagram      

Cause and Effect analysis

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Overview Cause and effect analysis is a discovery tool used to identify possible causes of a problem so they can be removed, ensuring the problem won’t happen again. Also known as Root cause analysis The tool Information is gathered in a group setting or workshop. Members of the group should be recruited so that multiple […]

Fishikawa

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Overview Fishikawa is a visualisation tool that provides a structure for information gathered by cause and effect analysis. Also known as Cause and effect diagram. Fishbone diagram Herringbone diagram. The tool Fisher’s Process of Transition, and its associated Personal Transition Curve (see following diagram), provides an insight into how individuals respond to change. Fishikawa helps […]

Five Whys

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Overview Five Whys is used to explore cause-and-effect relationships and to unearth underlying processes that are the root causes of a particular problem. Also known as The tool The tool is used to identify the root cause of a problem by repeating the question Why? over and over. The purpose of the tool is to […]

Pareto analysis

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Overview Pareto analysis is based on the observation that the majority of a product’s defects (80%) arise from a small number of causes (20%). Also known as Pareto principle. 80/20 principle. The tool The 80/20 principle is a generalisation, rather than a hard and fast rule. Knowing where the most common problems arise allows analysts […]

Tree diagram

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Overview Tree diagrams present causes and effects as a hierarchy. They provide an alternative way for gathering and presenting information to Fishikawa. Also known as Causal mapping Cause mapping Cognitive mapping Method network analysis Problem trees The tool In the following image, the problem being investigated (Effect) is shown at the bottom of the diagram, […]