Compare the existing quality control policy of LATM and the proposed policy ICTM. Can you comment upon
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Compare the existing quality control policy of LATM and the proposed policy ICTM. Can you comment upon the flaw with the existing system?
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5. Quality Control Tests The cost of quality assurance in manufacturing IC chips is very high. Moreover, as the complexity of IC chip design increases, the probability of faulty pro- duction also goes up. Since it is practically impossi- ble to attain 100% yield on any IC chip manufactur- ing, quality checks are incorporated at several stages of the manufacturing process. Industry experts put emphasis on the requirement for routinely design- ing statistical procedures to monitor the presence of defect clustering. The entire industry is increasingly turning toward statistical methods for quality control. ABCtronics has also adopted a similar approach. Analysis of produc- tion data has revealed that the probability of produc- ing a defective chip is 0.004. The company is cur- rently considering whether to incorporate a new IC growth technology, namely, "defect-free manufactur- ing," which can bring down the probability of pro- ducing a defective chip to 0.002. ABCtronics currently applies the Lot Acceptance Testing Method (LATM) for quality check. An auto- mated machine is employed to take a sample of 25 IC chips one by one randomly from a lot of 500 without replacement. It means the chip already drawn from the lot is not returned to the lot when the next chip is selected, and the lot size goes down. If the sample has less than two defectives then the lot is accepted; otherwise it gets rejected. The in-house testing team has conducted their analysis and found that every lot of 500 IC chips contains two defectives on average. The QRT has proposed a new design for quality control to the board for approval. Scrapping the exist- ing quality control policy, LATM, they want to bring in a new type of testing called Individual Chip Testing Method (ICTM), designed based on "defect-free man- ufacturing." According to the proposal from QRT, a sample of 25 IC chips is to be taken one by one from a lot of 500, but this time they will allow replace- ment. It signifies the chip already drawn from the lot is returned to the lot when the next chip is selected, and the lot size remains the same for each selection. If a defective chip is found, the rework will immediately be done on that chip. The rework is usually done by performing a functional test on the internal circuitry of that IC chip (Tsai and Ho 2000). The proposal was aimed at establishing ABCtronics as a reliable brand in the IC chips market and also for retaining a good relationship with its biggest customer, XYZsoft. 5. Quality Control Tests The cost of quality assurance in manufacturing IC chips is very high. Moreover, as the complexity of IC chip design increases, the probability of faulty pro- duction also goes up. Since it is practically impossi- ble to attain 100% yield on any IC chip manufactur- ing, quality checks are incorporated at several stages of the manufacturing process. Industry experts put emphasis on the requirement for routinely design- ing statistical procedures to monitor the presence of defect clustering. The entire industry is increasingly turning toward statistical methods for quality control. ABCtronics has also adopted a similar approach. Analysis of produc- tion data has revealed that the probability of produc- ing a defective chip is 0.004. The company is cur- rently considering whether to incorporate a new IC growth technology, namely, "defect-free manufactur- ing," which can bring down the probability of pro- ducing a defective chip to 0.002. ABCtronics currently applies the Lot Acceptance Testing Method (LATM) for quality check. An auto- mated machine is employed to take a sample of 25 IC chips one by one randomly from a lot of 500 without replacement. It means the chip already drawn from the lot is not returned to the lot when the next chip is selected, and the lot size goes down. If the sample has less than two defectives then the lot is accepted; otherwise it gets rejected. The in-house testing team has conducted their analysis and found that every lot of 500 IC chips contains two defectives on average. The QRT has proposed a new design for quality control to the board for approval. Scrapping the exist- ing quality control policy, LATM, they want to bring in a new type of testing called Individual Chip Testing Method (ICTM), designed based on "defect-free man- ufacturing." According to the proposal from QRT, a sample of 25 IC chips is to be taken one by one from a lot of 500, but this time they will allow replace- ment. It signifies the chip already drawn from the lot is returned to the lot when the next chip is selected, and the lot size remains the same for each selection. If a defective chip is found, the rework will immediately be done on that chip. The rework is usually done by performing a functional test on the internal circuitry of that IC chip (Tsai and Ho 2000). The proposal was aimed at establishing ABCtronics as a reliable brand in the IC chips market and also for retaining a good relationship with its biggest customer, XYZsoft.
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Auditing and Assurance Services
ISBN: 978-0077862343
6th edition
Authors: Timothy Louwers, Robert Ramsay, David Sinason, Jerry Straws
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