Evaluating your quality

The most common way to analyze the data you collect is to use statistics. Statistics serve many purposes within quality control:

_ Statistics allow you to determine which processes or parts of processes are causing your company the most problems (by using the 80/20 rule — 80 percent of your problems are caused by 20 percent of what you do).

_ You can use statistics for sampling so that you don’t have to test 100 percent of the items you make.

_ Statistics can help you spot relationships between the values you measure — even if the relationships aren’t obvious. They also allow you to identify small variations in your process that can lead to big problems if you don’t correct them. Although statistics can seem daunting, you can use many simple tools to greatly improve your quality — tools that don’t require an advanced degree in statistics!

Although much of statistics allows you to look back only at what has happened in the past, Statistical Process Control (SPC) allows you to identify problems before they can negatively impact the quality of your product or service. The basic idea behind SPC is that if you can spot a change in a process before it gets to the point of making bad products, you can fix the process before bad products hit the shelves.

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