Robust Design
The design of products to be less sensitive to variations, including manufacturing variation, environment and abuse, increasing the probability that they will perform as intended. It is an integrated system of tools and techniques that are aimed at reducing product or process performance variability while simultaneously guiding that performance towards an optimal setting. Robustness measures are usually implemented for designs that are new so that the best values of the critical functional parameters are uncovered. Robust Design follows the methods first proposed by Genichi Taguchi. click here for P-Diagram

Rolled Throughput Yield
Probability that a product will pass through the entire process without rework and defects. It is the product of the First Time Through (FTT) of all process steps.

Root Cause Investigation
Steps involved in conducting a good root cause analysis - 1. understand the goal of the analysis and be objective, 2. obtain a clear understanding of the failure, 3. clearly identify all possible root causes, 4. evaluate the likelihood of each root cause, 5. converge on the most likely root cause, 6. clearly identify and evaluate all possible corrective actions, 7. select the optimal corrective action, 8. verify the corrective action(s)