Pratique du Shadowing: QC 7 tools – Cause and Effect Analysis (Fishbone) Diagram Introduction - Apprendre l'anglais à l'oral avec la vidéo
Création de la leçon...
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Hello everyone, this is Working Bear.
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Today I want to introduce you to something called the Fishbone Diagram, also known as a Cause and Effect Analysis Diagram.
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Many of you might already know what a Fishbone Diagram is, but do you know how to actually draw one?
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And what should you watch out for when creating one?
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As the name suggests, the diagram looks like the skeleton of a fish.
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That's where it gets its nickname.
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Its formal name is Cause and Effect Analysis Diagram, because it's used to trace a problem, effect, back to its possible causes.
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Originally, fishbone diagrams were used in product design to analyze causes of failure, or in manufacturing to find the root cause of quality issues and come up with solutions.
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Nowadays, people use it in many industries to solve everyday work and life problems, too.
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Some people also call it the Ishikawa Diagram, named after Dr. Kaoru Ishikawa, a Japanese quality control expert who developed this tool.
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Drawing a fishbone diagram is actually very simple.
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The basic version just uses a few arrows.
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If you're someone who likes a little more creativity, check out Working Bear's YouTube video, How to Draw a Unique Fishbone Diagram in PowerPoint.
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When quality instructors teach us how to draw fishbone diagrams, they usually mention that there are two main styles, based on the direction the fish's head points.
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When the fish head points to the right, it's a cause-oriented fishbone diagram.
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The head represents the problem, and the bones show possible causes.
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So you write the problem that has already occurred at the fish's head.
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The topic usually starts with why or directly names the issue, like, oh, why am I often late to work?
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Oh, why is the SMT component attrition rate so high?
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Then list the possible causes along the bones of the fish.
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When the fish head points to the left, it's a solution-oriented fish bone diagram.
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The head represents a goal, and the bones list potential solutions or actions.
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The topic often starts with how to improve, prevent, solve, like, oh, how to avoid being late to work, oh, how to reduce the SMT component attrition rate,
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then write possible countermeasures along the bones.
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When used correctly, a fishbone diagram can be a powerful tool to solve tough problems.
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In everyday life or at work, we often face issues.
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Some problems are simple.
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You can identify the cause right away, so no diagram is needed.
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But other times, the cause is hidden and hard to figure out.
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Our thoughts may become too scattered or unfocused to find the real root.
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That's when a fishbone diagram comes in handy.
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It helps you sort out all those scattered thoughts, narrow them down, and find the main possible causes.
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After that, you can collect data, use stratification analysis, or prioritize the possible causes, verify them one by one,
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and finally take action with a solid long-term solution.
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So, before you draw a fishbone diagram, you should already have some ideas about what might be causing the problem.
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Actually, whether you have ideas or not, Working Bear strongly recommends gathering a cross-functional team for a brainstorming session.
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List all possible causes based on the problem, then use the fishbone diagram method to organize and discuss the likelihood of each cause.
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As the saying goes, two heads are better than one, and this kind of teamwork helps prevent blind spots or tunnel vision.
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Now let's walk through how to hold a meeting to create a fishbone diagram.
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One, gather the right people.
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Bring together everyone related to the issue or those with relevant knowledge or experience.
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Avoid having just one person draw the diagram alone.
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A good group size is around 4 to 10 people.
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Two, use a whiteboard or large sheet of paper.
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It's a good idea to have several colored markers.
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Each person can use a different color.
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These days, many people also use mind mapping software to draw the diagram digitally.
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Three, start drawing the fishbone diagram.
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Begin by sketching a basic fishbone shape on the board or paper, with the head pointing to the right, arrow to the right.
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Write the problem clearly at the head of the fish.
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Be sure to describe the issue in detail, its characteristics, symptoms, or signs, so everyone understands the context.
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Label the main bones with major causes, the branches with subcauses, and the small tips with minor causes.
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If you're analyzing design or manufacturing issues, many experienced teams use the classic 6M categories for the major causes,
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manpower, method, material, machine, measurement, and mother nature, also call environment.
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These six categories usually cover all types of causes and often relate to different departments, helping the team think broadly and clarify responsibilities.
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Of course, you're free to group your main causes differently.
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It doesn't have to follow the 6M structure.
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Also, remember to place more likely or direct causes closer to the fish's head
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and less likely or distant causes nearer the tail.
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This helps focus attention on the most probable causes.
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The goal is to make it easy for others, especially people unfamiliar with the issue or decision makers, to quickly see which causes are major and which are minor.
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After all, reports are often made for others, so if your fishbone diagram is clear, there's less need for further explanation.
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Four, take turns sharing causes.
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Each participant should take 15-20 seconds to say one possible cause.
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Keep going without interruptions.
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No criticizing or questioning allowed during this phase.
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The host or a note taker writes down each point on the diagram.
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5. Time Limits Limit each person's speaking time to 20 seconds before moving to the next.
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After a few rounds, once you've gathered 60-80 potential causes or people stop contributing, wrap up the brainstorming.
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Try to keep the whole session under 30 minutes.
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6. Prioritize the causes Now go through the list of causes.
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Have each participant pick the ones they believe are most significant.
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Circle these in red on the diagram once the group agrees.
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Seven, narrow down the key causes.
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Next, go through the circled causes again.
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Let everyone pick out the most critical ones from the red circles.
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Mark those with a second colored circle.
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Repeat this process until no more can be added.
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Finally, review the entire fishbone diagram.
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The causes with the most circles are likely the main culprits behind the problem.
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Now it's time to take action and find solutions based on those key causes.
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Now, let's take a look at this fishbone diagram example.
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Why have I been showing up late to work recently?
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This is a typical right-facing fishbone diagram,
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used to trace the possible causes of a problem problem.
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And here's another one.
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How can I avoid being late to work?
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This is a left-facing fishbone diagram that focuses on finding solutions.
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The next example is something Working Bear previously shared on the blog, a fishbone diagram about the source of oil contamination on keypad circuits.
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Back then, Working Bear explained that a product at a previous company had a serious DOA, dead on arrival, complaint.
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Most of the defective units had unresponsive keypads, specifically on the 3, 6, and 9 keys.
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The root cause turned out to be oil contamination.
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My company formed a temporary task force to investigate, even sending engineers to the contract manufacturer's factory.
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To their credit, the factory was cooperative and had already done some internal troubleshooting on their own.
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After a detailed investigation and summarizing findings with a cause and effect diagram,
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the most likely root cause pointed to an operator mistakenly using flux instead of IPA, isopropyl alcohol, as a cleaner.
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This flux was applied directly to the keypad contact circuits on the PCB.
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Even though the source of the oil was identified, verifying it became another challenge.
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Here, Working Bear briefly explained the two-part verification process simply.
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First, we sent the returned defective units to a lab for chemical analysis.
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We used FTIR, Fourier Transform Infrared Spectroscopy, because EDS, Energy Dispersive X-ray Spectroscopy,
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only detects elements, not compounds.
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The results showed a mixture of IPA and flux.
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Second, we simulated three possible contamination scenarios.
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A mixture of IPA and flux, we applied each substance to the PCB circuit,
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then assembled the units immediately and let them sit for 24, 48, and 72 hours.
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The results showed that the flux-only samples looked most similar to the actual oil stain issue, but didn't show any white powder.
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The IPA and flux mixture did produce white powder, but didn't recreate the oily appearance.
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So the likely culprit was a flux-heavy mixture of IPA and flux.
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Eventually, the contract manufacturer admitted that their operators may have mistakenly used flux instead of IPA.
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And during our on-site audit, we found that both flux and IPA were stored in the same cabinet.
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To a new operator, the two containers might have looked the same, which made it easy to confuse one for the other.
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This mix-up likely led to cross-contamination and the use of the wrong cleaning agent.
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If you're interested in this oil contamination case, check out Working Bear's video.
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The case study, oil and white powder contamination on PCB keypad contact, circuits causing keypad failures.
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That's it for today's sharing.
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If you're interested in electronics manufacturing, be sure to subscribe to Working Bear's YouTube and podcast channels.
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Don't forget to like, subscribe, and share.
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And if you can, please leave us a five-star review on Apple Podcasts.
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It helps more people discover Working Bear's show.
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All related links can be found in the episode description.
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That's it for now.
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Bye bye!
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau C1 s’appuie sur la vidéo « QC 7 tools – Cause and Effect Analysis (Fishbone) Diagram Introduction ». Les mots qui reviennent le plus souvent : diagram, fishbone, flux, issue, Ipa. Cette vidéo contient 123 phrases et 1609 mots à répéter en shadowing. La partie parlée dure 9:25. Le locuteur parle à un rythme naturel d’environ 171 mots par minute, proche d’une conversation courante. Seuls 79 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
Les 15 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| diagram nom | /ˈdaɪ.ə.ɡɹæm/ | diagramme, schéma |
| fishbone nom | arête, arête de poisson | |
| flux nom | /flʌks/ | décapant |
| contamination nom | /kənˌtæm.əˈneɪ.ʃən/ | contamination |
| attrition nom | /əˈtɹɪʃən/ | usure |
| brainstorming nom | remue-méninge, brainstorming | |
| culprit nom | /ˈkʌlpɹɪt/ | coupable |
| mistakenly adverbe | /mɪˈsteɪ.kən.li/ | à tort |
| prioritize verbe | /pɹaɪˈɒɹ.ə.taɪz/ | prioriser |
| scatter verbe | /ˈskætɚ/ | se disperser, disperser |
| defective adjectif | /dɪˈfɛktɪv/ | défectueux |
| participant nom | /pɑːɹˈtɪsəpənt/ | participant, participante |
| analyze verbe | /ˈæn.əˌlaɪz/ | analyser |
| verify verbe | /ˈvɛɹɪfaɪ/ | vérifier |
| subscribe verbe | /səbˈskɹaɪb/ | abonner, s'abonner |
Les verbes à particule que vous entendrez
| Mot | Sens |
|---|---|
| check out verbe | mater, regarder |
| go through verbe | traverser |
| come up with verbe | inventer, imaginer |
| figure out verbe | cerner |
| pick out verbe | distinguer, faire la distinction |
| show up verbe | apparaître, se montrer se pointer |
| sort out verbe | résoudre |
| wrap up verbe | emballer |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | is needed · is hidden · are often made |
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | has already occurred · you've gathered |
| Propositions relatives who / which + proposition — une précision sur une personne ou une chose | someone who likes · and which are |
Prononciation à surveiller
Le locuteur utilise 10 contractions et formes réduites, comme you're, didn't, doesn't. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « sh » et « zh »: contamination /kənˌtæm.əˈneɪ.ʃən/, attrition /əˈtɹɪʃən/, countermeasure /ˈkaʊ̯ntəmɛʒə/, interruption /ˌɪntəˈɹʌpʃən/, verification /ˌvɛ.ɹə.fɪˈkeɪ.ʃən/
- Mots longs — placez bien l’accent: contamination /kənˌtæm.əˈneɪ.ʃən/, mistakenly /mɪˈsteɪ.kən.li/, prioritize /pɹaɪˈɒɹ.ə.taɪz/, participant /pɑːɹˈtɪsəpənt/, countermeasure /ˈkaʊ̯ntəmɛʒə/
Les sons difficiles pour les francophones :
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: digitally /ˈdɪd͡ʒɪtəli/, sketch /ˈskɛt͡ʃ/
- /r/ anglais — langue recourbée, sans frotter la gorge: diagram /ˈdaɪ.ə.ɡɹæm/, attrition /əˈtɹɪʃən/, culprit /ˈkʌlpɹɪt/, orient /ˈɔɹ.iˌɛnt/, prioritize /pɹaɪˈɒɹ.ə.taɪz/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme diagram, fishbone, flux.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.