Guidance on using variable charts (e.g., X-bar & R) and attribute charts (e.g., p-charts for defect rates). The IPC-91xx Family

The , titled "General Guidelines for Implementation of Statistical Process Control (SPC)," is a critical document for electronics manufacturers aiming to move from reactive inspection to proactive process prevention. Released in November 1999, it harmonizes the previous IPC-PC-90 with the international ISO 11462-1 standard to provide a comprehensive framework for reducing process variation. What is IPC-9191?

The standard provides a strategic framework to help manufacturers move from "final inspection" (detecting defects) to "process control" (preventing defects). It focuses on reducing variation in processes such as PCB fabrication, assembly, and testing. Key Elements of IPC-9191 SPC Philosophy:

X-bar & R, p, np, c, and u charts to monitor process stability. Analysis Tools: