That Day, Calls About Delayed Deliveries Nearly Blew Up My Phone
Ah, do you remember that incident in Q3 last year? On our most critical 12-inch wafer process line, the yield for a certain batch suddenly plummeted. Calls from the production line manager kept coming in, and even the General Manager personally asked: "What exactly happened? Haven't all our suppliers been evaluated?" At that time, I was really stressed, because the numbers on the scorecard looked perfectly fine, so why did things go so terribly wrong when an issue arose? Later, we discovered that the problem fundamentally lay with our own "supplier scorecard."
Where Did the Problem Lie? Were Your Weightings Set Incorrectly?
Frankly, when we evaluate suppliers, do we treat all criteria equally? Or do we simply fail to understand which items are truly critical pain points for us? Most companies, when designing supplier scorecards, will definitely include these three major categories: Quality, Delivery, and Cost. But honestly, have you truly set corresponding "weightings" for them based on your own production characteristics? If you set the weightings for all items to be the same, or just arbitrarily decided them, then when issues arise, no matter how good the scorecard looks, it's merely self-deception.
So the key is, you need to first understand what is least acceptable to you?
- Quality: This should be the lifeblood of the semiconductor industry, shouldn't it? A single process deviation could destroy millions of wafers.
- Delivery: Material shortages lead to line stoppages, and line stoppages burn money. If your product is highly seasonal, then delivery time is more important than anything else.
- Cost: Price should certainly be reasonable, but if you sacrifice quality or delivery to save a single dollar, it's absolutely not worth it.
How to Implement This in Practice? Give Meaning to Your Weightings
To design a meaningful scorecard, you need to think about weightings from the perspective of "risk" and "impact." For example, if your product is a high-end chip with extremely high yield requirements, even a tiny impurity could lead to failure. In that case, the weighting for quality should be increased.
At that time, we redesigned the scorecard, assigning different weighting ratios for different types of suppliers (e.g., critical raw material suppliers vs. equipment parts suppliers):
* Critical Raw Material Suppliers:
1. Quality: 50% (e.g., Cpk must be at least 1.33 to be qualified; below 1.0 is an automatic F grade)
2. Delivery: 30% (On-time delivery rate 95% or higher; 5 points deducted for every 1% below that)
3. Cost: 20% (Price competitiveness and negotiation space)
* In other words, if quality standards are not met, even if delivery is punctual and prices are low, they will not be considered a good supplier.
* Non-Critical Consumable Suppliers:
1. Quality: 30% (Basic functionality verification passed is sufficient)
2. Delivery: 40% (To avoid line stoppages)
3. Cost: 30% (Greater emphasis on price competitiveness)
* Here, delivery and cost become relatively more important, because for these types of materials, as long as they are usable, price and on-time delivery impact operational efficiency.
As you can see, for the same Quality, Delivery, and Cost criteria, a shift in weightings sends a completely different signal to suppliers.
The Most Common Pitfall: Arbitrary Weighting Ratios
The biggest pitfall I encountered was initially evaluating "all suppliers" using "the same set of weighting ratios." I remember one time, we had an equipment parts supplier whose cost score was very high due to highly competitive pricing, making their overall score look quite good. However, in reality, the parts they provided had a yield Cpk of only about 1.08, barely passing, but often caused our equipment to malfunction. Their delivery was also consistently delayed by a day or two. Because the weightings for quality and delivery were set too low, these issues were overshadowed by the "high cost score." It wasn't until the equipment actually broke down that we realized we had been deceived by the scores. Frankly, you need to customize your weightings according to different supplier attributes; otherwise, the data will merely look good but fail to reflect the true situation.
One Thing You Can Do Today
Go back and re-examine your supplier scorecard, and consider whether the weightings for "Quality, Delivery, and Cost" truly reflect your expectations and risks for different suppliers.
Article Category: Quality Assurance Management