Friends, lecture 15 is continuation to lecture 14. In this lecture, we will understand about the other process performance measures such as roll, throughput yield and cost of poor quality. yield is a pass rate of product and as defined in various ways, such as first time yield, f t y number of good units produced divided by the number of total units going into the process rolled throughput yield RT y. Rolled throughput yield is similar to ft VI. But process rework are also considered while calculating yield. For example, we have a series of processes such as a, b and c. Each process has some inputs and outputs.

Output of one process is the input of another process and at every process stage, the yield reduces by rework, rejection etc Process yield examples first time yield. Suppose, there is a process X, which has three sub process namely a B and see input and output unit or each sub processes are at process a input was 100 units out of hundred, only 90 units are passed out from process a. These 90 units go to process B as input process B's output was only 80 which goes as input to process C and final output was 75 units that is calculate the first time yield ft ft UI or process a is equal to output divided by input that equals 290 by hundred or 0.9. Similarly, ft vie for process B was 80 by 90 equals to 0.89 and similarly, our process c It was 0.94. Now total ft vi for the entire process is equals to 0.9 into zero point Eight Nine into 0.94 this is also seen as 75 divided by hundred that is equals to 0.75 that is calculated calculate rolled throughput yield in a similar manner How does RT vi differ from ft Why?

The difference is that while calculating RT vi we take into consideration of the rework or scrap to consider the same example, hundred units goes to process a and 90 units are passed out But in 90 outputs, fiber revoked and then scrapped it means we had to rework on five units while producing 90 outputs. That means, process a produced only edify units right first time. So, the rolled throughput yield was 0.85 by considering the UI works. Similarly, to view yourself the rolled throughput yield per process B and C. Now, the total rolled throughput yield for anti process is equal to 0.85 into 0.81 into 0.9 which is equal to 0.62. Could you analyze the difference between FTY and RDY rT vi was less than ft Why? So, which is best measure ft vi r RT VI.

In fact, RT VI is a more appropriate Process Performance Measure c o pq is another important Process Performance Measure C O P Q stands for Cost of poor quality. co pq can be defined as the cost involved in not doing the things right at the first time for calculation of CE o pq, we need to consider different elements of quality cost such as appraisal cost. It is the cost involved in the appraisal or inspection of product or services. Prevention cost cost of all activities for the purpose of prevention of failures. For example, training costs are So certification cost etc internal failure cost cost incurred in internal defects reworks and scraps during operations external failure costs, costs incurred to rectify the failure occurred at customer end, like warranty cost, product, recall cost, etc. Dr. Joseph Duran had explained the relation between component of costs and total cost in his