Post-installation failures of PCB modules tremendously increase the warranty cost and reduce the field system MTBF. Based on the system installation date and the return time of defective PCBs, we are able to generate a Pareto chart to visualize the early product life failures as shown in Fig. 8. Data represents the failure distribution of a PCB product line shipped and installed at customer sites for one year. Among all the failures, the chart shows that 34% of failures occurred within 30 days following the system installation. In fact, 18% of the failures occurred within 10 days of installation. The chart also shows that nearly 60% of the PCBs failed or returned within 90 days across 370 days. These data strongly support the hypothesis that the process needs to be improved to reduce the early life failures of the product.