Shadowing Practice: The Three NPI Phases Explained - Learn English Speaking with Video
Creating lesson...
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Then you say you start your NPI process
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and this is comprised of three phases and after
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that it's really ready for ongoing mass production and ramp up of the volumes, right?
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Correct.
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So what are these three phases?
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So the three phases are engineering validation, design validation, and production validation.
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Some people, a lot of people are familiar with these terms
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but they're not familiar with what the actual meaning is and how you qualify from one phase to the next.
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So a lot of people have misinterpreted this to mean that you've got three chances to build it and get it right.
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That's not correct.
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Each phase has different meaning.
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So the engineering validation you want to prove out from an engineering point of view that your tooling is good, your enclosures are good, your PCBA is good,
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that your features are all present and that your device is working as intended.
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At the end of an ADT build you should sit in a room with all of your engineers
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and all of them can say that their functions have been complete and this product is performing as expected.
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So the output is not only a prototype that's much closer to what's intended
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because it is made this time with the same manufacturing process as it is intended, it also comes on the supply chain side with a BOM,
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so you already started to select the component suppliers, you've been working very closely with obviously also the assembly and testing supplier.
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On the technical side you've gone into all the details of the design, the mechanical design, engineering design, the firmware design and so on.
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Is that correct?
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That's correct, yes.
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So that EBT part that you've built should be fully representative of your supply chain and your processes.
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About This Lesson
You're practicing English with "The Three NPI Phases Explained" using the Shadowing technique — a method originally developed for professional interpreter training.
Focus on sounding like the speaker — not just repeating words. With 15–30 minutes of daily practice, you'll build real-world speaking confidence.
What is the Shadowing Technique?
Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.