The production process for an electronic product has 12 major steps. If each of the first six production steps is at a 5-Sigma quality level and the remaining steps are at a 5.5 sigma quality level, calculate the total percentage of error-free products manufactured.

We calculate the Rolled Throughput Yield (RTY) by multiplying the percentage of error-free units at each step of the process.

• DFU is the percentage of error-free units in a step.
• n is the number of steps.

Now, we get the respective yield against 5-sigma and 5.5- sigma from the yield-to-sigma conversion table as below:

• 5-sigma = 99.9770%
• 5.5- sigma = 99.9970%

So,

Total percentage of error-free products manufactured = 99.84%