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Fishbone / Ishikawa Diagram
Fishbone / Ishikawa Diagram
Fishbone / Ishikawa Diagram
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Overview

Track the reasons behind challenges and problems in any domain using this hierarchy based tool — bonus, it looks like a fish, what’s no ...

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Utram tandem linguam nescio? Ex quo, id quod omnes expetunt, beate vivendi ratio inveniri et comparari potest. Non autem hoc: igitur ne illud quidem. Cur tantas regiones barbarorum pedibus obiit, tot maria transmisit? Cum autem negant ea quicquam ad beatam vitam pertinere, rursus naturam relinquunt.

Facile est hoc cernere in primis puerorum aetatulis. Restinguet citius, si ardentem acceperit. Nihil ad rem! Ne sit sane; Est enim effectrix multarum et magnarum voluptatum. Num quid tale Democritus?

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Actionable Takeaways
  • Identify the problem, or effect. 

Define the problem or end effect that is being investigated and w ...

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Virtutibus igitur rectissime mihi videris et ad consuetudinem nostrae orationis vitia posuisse contraria. Duo Reges: constructio interrete. Est autem etiam actio quaedam corporis, quae motus et status naturae congruentis tenet; Quae qui non vident, nihil umquam magnum ac cognitione dignum amaverunt. Etenim semper illud extra est, quod arte comprehenditur. Illa tamen simplicia, vestra versuta.

Ita credo. Innumerabilia dici possunt in hanc sententiam, sed non necesse est. In qua si nihil est praeter rationem, sit in una virtute finis bonorum; Nos paucis ad haec additis finem faciamus aliquando; Bona autem corporis huic sunt, quod posterius posui, similiora. Deinde disputat, quod cuiusque generis animantium statui deceat extremum.

Cum id quoque, ut cupiebat, audivisset, evelli iussit eam, qua erat transfixus, hastam. Qui non moveatur et offensione turpitudinis et comprobatione honestatis? Quid, si etiam iucunda memoria est praeteritorum malorum? Quis est enim, in quo sit cupiditas, quin recte cupidus dici possit? Cave putes quicquam esse verius. Solum praeterea formosum, solum liberum, solum civem, stultost; Nihil opus est exemplis hoc facere longius. Verba tu fingas et ea dicas, quae non sentias?

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Fishbone / Ishikawa Diagram is featured in these playbooks:
Limitations

The main issues with the diagram are the differentiation between causes and sub causes. For example, some causes might be complex, with many elements below them, becoming impractical to capture in the diagram. By breaking it up into separate categories, the diagram also does not lend itself to a more connected view of challenges. 

Finally, there is no clear prioritisation within the diagram — all causes seem equal, when in reality a sub cause, which is visually small, might be the key issue. Other causes and sub causes therefore might become a distraction.

In Practice

Internal damages at IKEA.

This paper from Ikea in Portugal describes a process improvement process to address the level of internal damages in Ikea stores. The diagram below was part of a broader analysis process.

Build your latticework
This model will help you to:

The fishbone or Ishikawa diagram, also known as the cause-and-effect diagram, is a core tool within quality management and is commonly used for improvements in products, manufacturing and other fields. 

Use the following examples of connected and complementary models to weave the fishbone diagram into your broader latticework of mental models. Alternatively, discover your own connections by exploring the category list above. 

Connected models: 

  • 5 Whys: in digging to root cause, use this as part of the fishbone process. 
  • Second order thinking: to go beyond the initial cause to sub causes. 
  • 4Ps of marketing: as possible categories. 

Complementary models: 

  • Risk matrix: to consider potential issues with consequences versus likelihood. 
  • Chain reaction/ domino effect: to consider the flow on effects of potential issues. 
  • First principle thinking: to identify and go below assumptions. 
  • Occam’s razor: to cut to the core of the issue. 
  • Divide and conquer: separating out and addressing potential causes.
Origins & Resources

The Fishbone Diagram was created by quality management pioneer Professor Kaoru Ishikawa in 1968. Ishikawa, an engineer, was a leader of quality management at Kawasaki at the time. In his 1986 book, Guide to Quality Control, Ishikawa argued that there were six other key quality tools in addition to what he called the ‘cause-and-effect diagram’, which were: control chart, histogram, flow chart, run chart, scatter diagram and Pareto chart. 

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