What holds yield back is often not technology
A large part of the yield problems in Taiwan’s manufacturing is not that the technology falls short, but that “the solution was never written down.” How a senior technician makes a judgment call, the logic an engineer uses to clear an abnormality, the pitfalls hit the last time a new material was introduced — this knowledge lives in people’s heads, not in the company’s systems. When the person leaves, the knowledge goes to zero, and the next person starts groping from scratch. Almost every factory repeats this cycle.
01. Same line — why does yield drop when the person changes?
Most managers’ first reaction is: “The new person isn’t experienced enough,” or “We need more training.”
But think about it: what is the training content? Experience told verbally by a senior technician, a feel learned by watching from the side, an instinct of “watch out for this, but I can’t really explain why.”
That isn’t training; it’s a gamble — betting that the new person happens to absorb the right part, that the senior technician happens to explain it fully, that the handover is long enough and goes well.
There is nothing wrong with apprenticeship itself. The problem is that apprenticeship has no backup.
When the senior technician retires, the knowledge retires too. When an engineer leaves, the logic for clearing abnormalities leaves too. Years of salary bought the person, not ownership of the knowledge.
02. “Can do it, can’t explain it” — a common organizational bottleneck
In technology-driven industries, this is almost the norm. People who are strong at execution are often not good at recording the process. Ask them “How did you solve that problem last time?” and they can demonstrate on the spot, but ask them to write it up and either there’s no time, or the written version is too brief for the next person to follow. It gets worse under pressure. When the line has a problem, everyone’s goal is “fix it now”; nobody’s goal is “record the reasoning this time.” The problem gets solved, the root cause is not documented, and when the same problem comes back, everyone takes the same long way round again.
This is yield’s “memory problem” — the solution is stored in people, not in the organization.
Using a high-tech X-ray machine to check whether a soap box has soap in it is precise but expensive. A simpler, more effective way might be just an industrial fan: an empty box is lighter and blows straight off the line.
Look at the essence first, then choose the tool — that is the real logic of cutting cost.
03. JIAHON’s technical documentation library: turning shop-floor know-how into company assets
What we compile is not confidential, but the “non-confidential details that often decide success or failure.” The library covers five kinds of content:
- 🔧 Production aid application guides: the details that often go wrong on the shop floor — common failure modes, design flaws and usage notes for carts, trays, EVA foam and ESD totes. A pitfall you have already hit doesn’t have to be hit again by the next person. Related products: carts · trays · EVA foam · ESD totes.
- 📋 Standard operating procedures (SOPs): clear work steps, inspection rhythm and checklists, so new staff and shift colleagues can get up to speed without relying on word of mouth, keeping work quality consistent.
- ⚗️ Material compatibility database: incompatibilities and potential risks among tapes, solvents and wipes. Before introducing a new material, check whether anyone has already hit a problem — instead of finding out after introduction.
- 📁 Qualification and close-out report templates: a common report framework so engineering, QA and purchasing speak the same language. Cross-department alignment shrinks from weeks to days.
- Structured troubleshooting logic: moving from guesswork to reproducible, traceable solutions. Problem definition → ranking hypotheses → designing verification → conclusion and improvement → locking it into the SOP. Every abnormality cleared becomes a reference for the next one.
04. What this means for your team
For engineering / QA / purchasing
- Fewer pitfalls, less blame, less rework
- Ready-made templates — no starting from a blank page every time
- A common language for cross-department reviews, instead of getting stuck with everyone saying something different
For management
- Knowledge stays in the company, not in individual heads
- Staff turnover no longer means knowledge goes to zero
- When something goes wrong, there is a record to check, and responsibilities are clear
05. Documents aren’t the goal — ending repeated mistakes is
Every good document means one less repeated pitfall.
Every good template means one less round of unproductive cross-department communication.
Every good case adds one more piece of evidence you can use directly. This compounds; it is not a one-off benefit. A technical documentation library becomes more valuable the more you build it, precisely because what it accumulates is organizational memory, not individual memory.
Topics JIAHON is currently expanding include: introducing ESD and cleanroom consumables; compatibility and residue risk in cleaning and wiping; common failure modes of trays and packaging; qualification templates for introducing special and alternative materials; and early warning for warehousing and lead-time risk.
The “What Makes JIAHON Different” series
- Part I | The three-way B2B purchasing dilemma: balancing technology, cost and risk
- Part II | How a full-range MRO supplier reduces stock-out risk and MOQ roadblocks
- Part III | Turning purchasing headaches into routine work: JIAHON’s cross-industry supply network
- Part IV | The devil is in the details — what unbranded consumables don’t tell you
- Part V | Senior technicians retire and yield drops? Five kinds of process knowledge to document, and how to start (this article)
- Part VI | From blame to management: a system-level fix for upgrading corporate purchasing
- Part VII | Let down by another new vendor? How JIAHON helps break the vicious purchasing cycle
- Part VIII | Stop comparing on price alone! Less-is-more MRO purchasing
- Part IX | Aggregated-demand economics: group-buying leverage for scattered needs
- Part X | Integrated service that lowers total cost of ownership
How much shop-floor know-how in your plant exists only in one person’s head right now?
Tell us the qualification items where you often get stuck and the points auditors often ask about — JIAHON will prioritize compiling the matching document pack for you.
A JIAHON affiliated company supplies customers throughout Taiwan.