Luyện nói tiếng Anh bằng Shadowing qua video: The Production Validation Test (PVT) Phase of the NPI Process
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Now, PVT, the final phase.
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Typically, how many pieces would you make, let's say a typical IoT product about this size,
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let's say, until you actually confirm this is correct, the right quality, the right production rate,
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we are confident that we can really just keep ramping up on this basis.
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If we've had a successful EVT and DVT, we would shoot for a thousand units of PVT.
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And you will not get a 99% yield rate most likely, you might have to settle with a 90% yield rate.
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And the parts that are failing are parts then that can be used for for internal testing, they can be used for debugging,
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they can be used for problem solving.
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But that's typically what we would shoot for to make sure that we're ready to qualify for mass production, which is the final phase.
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Because there's always a timing constraint right?
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There's a budget constraint of course the longer you spend there the more it's costing everybody including the suppliers right?
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Everybody just wants to go into mass production.
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Yes I mean most companies they need to be shipping products to make money to keep alive.
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If they want to wait till they don't, if they have to have 99% off the production line before they ship then they're not getting any revenue
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and and they're not going to be able to support their efforts until probably too late.
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So what's the timeline?
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Let's say PVT is confirmed that maybe you're at 90-95% first time yield rate.
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How long does it take you if there's, let's say, continuous production typically to get to 99%?
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It could be anything from one month to three or four months.
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depends on the complexity of the product and how diligent the product development and NPI phase has been.
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Vocabulary and speaking notes for this lesson
This C1 speaking lesson is built on the video “The Production Validation Test (PVT) Phase of the NPI Process”. The speaker keeps coming back to these words: production, product, rate, Pvt, yield. This video has 20 sentences and 298 words to shadow. The speech runs for 2:00. The speaker talks at a natural 150 words per minute, close to everyday conversation. 88% of the words are among the 3,000 most common in English; the rest is worth studying before you start. 4 of its 20 sentences are questions, so it is good practice for question intonation and short answers.
Key vocabulary in this video
The 13 most advanced words in the video, with pronunciation and meaning:
| Word | Pronunciation | Meaning |
|---|---|---|
| yield verb | /jiːld/ | To give as a result or outcome; to produce or render. |
| confirm verb | /kənˈfɝm/ | To strengthen; to make firm or resolute. |
| solve verb | /sɒlv/ | To find an answer or solution to a problem or question; to work out. |
| settle verb | /ˈsɛtəl/ | To determine (something which was exposed to doubt or question); to resolve conclusively; to set or fix (a time, an order of succession, etc). |
| continuous adjective | /kənˈtɪn.juː.əs/ | Without stopping; without a break, cessation, or interruption. |
| depend verb | /dɪˈpɛnd/ | To be contingent or conditioned; to have something as a necessary condition |
| qualify verb | /ˈkwɑ.lɪ.faɪ/ | To describe or characterize something by listing its qualities. |
| timeline noun | /ˈtaɪmˌlaɪn/ | A graphical representation of a chronological sequence of events (past or future). |
| complexity noun | /kəmˈplɛk.sɪ.ti/ | The state of being complex; intricacy; entanglement. |
| supplier noun | /səˈplaɪə/ | One who supplies; a provider. |
| constraint noun | /kənˈstɹeɪnt/ | Something that constrains; a restriction. |
| debug verb | /diːˈbʌɡ/ | To search for and eliminate malfunctioning elements or errors in something, especially a computer program or machinery. |
| diligent adjective | /ˈdɪlɪdʒənt/ | Performing with industrious concentration; hard-working and focused. |
Pronunciation to watch
The speaker uses 6 contractions and reduced forms, such as they're, don't, we're. Say them the short way, as you hear them.
- Long words — get the stress right: continuous /kənˈtɪn.juː.əs/, complexity /kəmˈplɛk.sɪ.ti/
How to practise with this video
- Listen to the whole video once without speaking and note the words you do not know.
- Start at 0.75× speed, shadow it sentence by sentence, then go back to normal speed once it feels easy.
- Record yourself and compare with the original, paying attention to words like yield, confirm, solve.
Phương Pháp Shadowing Là Gì?
Shadowing là kỹ thuật học ngôn ngữ có cơ sở khoa học, ban đầu được phát triển cho chương trình đào tạo phiên dịch viên chuyên nghiệp và được phổ biến rộng rãi bởi nhà đa ngôn ngữ học Dr. Alexander Arguelles. Nguyên lý cốt lõi đơn giản nhưng cực kỳ hiệu quả: bạn nghe tiếng Anh của người bản xứ và lặp lại to ngay lập tức — như một "cái bóng" (shadow) đuổi theo người nói với độ trễ chỉ 1–2 giây. Khác với luyện ngữ pháp hay học từ vựng bị động, Shadowing buộc não bộ và cơ miệng phải đồng thời xử lý và tái tạo ngôn ngữ thực tế. Các nghiên cứu khoa học xác nhận phương pháp này cải thiện đáng kể phát âm, ngữ điệu, nhịp điệu, nối âm, kỹ năng nghe và độ lưu loát khi nói — đặc biệt hiệu quả cho người luyện IELTS Speaking và muốn giao tiếp tiếng Anh tự nhiên như người bản ngữ.