A new Statistical Process Control (SPC) system was developed for the depot’s machine shop operations that addressed the unique technical challenge of statistically controlling processes with small unit sample sizes and high-product mix. Both ISO9000 and parts visibility require data traceability for both part and process data. To analyze data for problem resolution, out-of-control analysis, and variance component identification, both part and process traceability were implemented. This analysis was facilitated by using data stored in a distributed architecture built around a system-based relational database structure. The system supports both attribute and variable charts, Pareto analysis, and original equipment manufacturer (OEM) specifications superimposed on the standard control limits. Pre-control, short-run, and trend analysis are also supported. This is the first time that expert SPC has been applied on a distributed online basis throughout depot operations.