Comments on: The Critical Difference Between Defects and Defectives http://lssacademy.com/2009/05/27/the-critical-difference-between-defects-and-defectives/ Lean Manufacturing, Six Sigma, Lean Six Sigma, and Kaizen Sat, 12 May 2012 15:25:36 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Ken Walton http://lssacademy.com/2009/05/27/the-critical-difference-between-defects-and-defectives/comment-page-1/#comment-3344 Ken Walton Sat, 30 May 2009 13:04:34 +0000 http://lssacademy.com/?p=1287#comment-3344 IMHO, Defects on product, can be still be accepted if within certain tolerances set by customer. Defective........The product is not functioning properly, or is by no way acceptable in any way or form. No tolerances, whatsoever. IMHO, Defects on product, can be still be accepted if within certain tolerances set by customer.
Defective……..The product is not functioning properly, or is by no way acceptable in any way or form. No tolerances, whatsoever.

]]> By: Scott http://lssacademy.com/2009/05/27/the-critical-difference-between-defects-and-defectives/comment-page-1/#comment-3339 Scott Thu, 28 May 2009 19:38:42 +0000 http://lssacademy.com/?p=1287#comment-3339 First from the customer’s perspective it is either totally correct or defective. In the customers eye's it is also defective if it was not delivered on time, packaged correctly, and has the correct paper work for receipt and possibly certification. Producing a product to spec can only be tainted by not executing the total process. Let's not forget the metrics for the rest of the process. First from the customer’s perspective it is either totally correct or defective. In the customers eye’s it is also defective if it was not delivered on time, packaged correctly, and has the correct paper work for receipt and possibly certification. Producing a product to spec can only be tainted by not executing the total process. Let’s not forget the metrics for the rest of the process.

]]> By: Observer http://lssacademy.com/2009/05/27/the-critical-difference-between-defects-and-defectives/comment-page-1/#comment-3338 Observer Thu, 28 May 2009 17:28:37 +0000 http://lssacademy.com/?p=1287#comment-3338 Can't agree more. Basically defects are to be eliminated. Without eliminating them defectives can not be eliminated. If 5 things on the average are wrong in one unit, practically every unit will go through a rework. Can’t agree more. Basically defects are to be eliminated. Without eliminating them defectives can not be eliminated. If 5 things on the average are wrong in one unit, practically every unit will go through a rework.

]]> By: Mike http://lssacademy.com/2009/05/27/the-critical-difference-between-defects-and-defectives/comment-page-1/#comment-3336 Mike Thu, 28 May 2009 12:57:40 +0000 http://lssacademy.com/?p=1287#comment-3336 I disagree. I see two important metrics here. I've always been one to disagree that DPO or DPMO is the only quality metric one should look at. Think about a very complicated assembly with thousands of opportunities per assembly and one or two defects per part but many defectives throughout the production run. Compare that to a simple part with few opportunities and not very often a part is defective. The DPMO could be the same for both situations but paint a totally different picture looking at the actual process. A good way to cheat this metric is to increase the possible number of opportunities for a defect to decrease the DPMO (sure, a meteor might hit my part causing a defect, but this time it didn't). Which this all begs the question, how do you classify an opportunity for a defect. Looking at first time throughput yield is a good metric to look at defectives/total produced. A more detailed metric beyond that (secondary metric) should be average defects/defective. I've always thought this combination of metrics paints the clearest picture of a process. I disagree. I see two important metrics here. I’ve always been one to disagree that DPO or DPMO is the only quality metric one should look at. Think about a very complicated assembly with thousands of opportunities per assembly and one or two defects per part but many defectives throughout the production run. Compare that to a simple part with few opportunities and not very often a part is defective. The DPMO could be the same for both situations but paint a totally different picture looking at the actual process. A good way to cheat this metric is to increase the possible number of opportunities for a defect to decrease the DPMO (sure, a meteor might hit my part causing a defect, but this time it didn’t). Which this all begs the question, how do you classify an opportunity for a defect.

Looking at first time throughput yield is a good metric to look at defectives/total produced. A more detailed metric beyond that (secondary metric) should be average defects/defective. I’ve always thought this combination of metrics paints the clearest picture of a process.

]]> By: TJBraun http://lssacademy.com/2009/05/27/the-critical-difference-between-defects-and-defectives/comment-page-1/#comment-3335 TJBraun Thu, 28 May 2009 12:15:58 +0000 http://lssacademy.com/?p=1287#comment-3335 To pose an answer to the age old question, How many angels can dance on the head of a pin? A unit can have infinite defects and each defect can have its own assignable cause. Therefore, each defect is improtant when taking corrective actions to prevent reoccurence of the defect. Using the standard metric of defects per million opportunities or DPMO should allow the manufacturer to mitigate the defective unit mentality and capture the cumulative effects of multiple defects within a single unit. To pose an answer to the age old question, How many angels can dance on the head of a pin? A unit can have infinite defects and each defect can have its own assignable cause. Therefore, each defect is improtant when taking corrective actions to prevent reoccurence of the defect.
Using the standard metric of defects per million opportunities or DPMO should allow the manufacturer to mitigate the defective unit mentality and capture the cumulative effects of multiple defects within a single unit.

]]> By: T.J. http://lssacademy.com/2009/05/27/the-critical-difference-between-defects-and-defectives/comment-page-1/#comment-3334 T.J. Thu, 28 May 2009 01:29:06 +0000 http://lssacademy.com/?p=1287#comment-3334 Never heard it put like this but makes sense. Never heard it put like this but makes sense.

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