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Remember the first time in school you used a calculator instead of paper and pencil to add, subtract, multiply or divide? It made the job so easy, it almost felt like cheating. The technology freed you to focus on the problem rather than the mechanics of arithmetic. Statistical process control (SPC) methods have been applied in manufacturing process control since the early 1930s. Over the decades, countless hours were expended plotting charts with pencils on graph paper. Then computers arrived and, like the calculator did for the schoolboy, freed the engineer to spend time analyzing the process instead of focusing on the formulae. Over the years SPC software has matured in functionality, making statistical analysis quicker, more powerful and more flexible. The driving force has made the software easier for the practitioner to use. SPC software will continue to develop in ways that eliminate unnecessary steps, freeing quality practitioners from rote tasks and enabling them to focus efforts on improving the manufacturing process.

The Past SPC software can show real-time control status of all data collection stations plant wide. As access to computers in the manufacturing environment grew, along came the first wave of products that automated the tasks associated with statistical analysis. Although they provided the tools for engineers to analyze the manufacturing process, these systems were difficult for many practitioners to use. They required tedious data entry and a Ph.D. statistician's knowledge to configure the software and analyze the data--a combination of tasks and abilities not easily married. Furthermore, obtaining interpretable results was a process completed long after the production run being analyzed had finished. This delay complicated the task of addressing process problems that continued to change--and probably resulted in additional process variation--in the interim.

The Present Many timesaving features have since been added to advance SPC software usability. These software systems leverage other technologies such as automation standards and Internet access to simplify and integrate tasks--making administration, data collection, statistical analysis and reporting easier for today's practitioners.

Administration Today's SPC software is designed to make the setup of parts and processes easy to accomplish. Common graphical user interface features such as tree views with drag-and-drop functionality dominate the market. These features reduce the repetitive tasks of separately creating items with only minor differences and instead allow for copying and duplicating similar components and then assigning unique parameters. The introduction of communication standards across various platforms takes this ease-of-administration approach even further. Now SPC software can be configured to automatically obtain and update parts, processes, specifications, nominals and other pertinent information from values stored in other enterprise software systems such as manufacturing resource planning, manufacturing execution systems and human machine interface. Not only does this eliminate the effort spent re-entering and updating configuration information in multiple packages, it saves the effort expended tracking down entry errors that occur when the process is done manually.