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# Seven Basic Quality tools documents

Definition of Quality Management -- it is a method for ensuring that all the activities necessary to design, develop and implement a product or service are effective and efficient with respect to the system and its performance. It is also a principle set by the company to endure the continuous advocacy of quality services and products, or the further improvement of it.

Welcome to QT-charts knowledge base section. Hopefully you will find some of them useful in your work.
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# Formulas used to calculate capability are:

## •    Cpk = min {Cpu, Cpl}

The Cpk is the most commonly used index for calculating capability, however some have found that the Ppk index is actually better.  The Cpk is used to gauge the potential capability of a system, or in other words, a system’s aptitude to perform.  The Ppk (and relative pp and Pr) actually measure the performance of the system.  To determine which of the indexes to use, determine whether you want to analyze the actual performance (Ppk) or the potential capability of the system (Cpk).  Cpk is calculated with sigma equal to 3, which is an estimated sigma.  Calculating Ppk uses a calculated sigma from the individual data.

# A Real World Example - Auto Body Specialists

This example will show how to implement the analysis into a real world situation.

## The capability analysis is a powerful tool to assess the systems ability to perform and to study the results of improvement efforts.  Before determining whether an improvement is needed in the system, analysts must understand the as-is system thoroughly.  Capability analysis will aid them in finding necessary information to decide if improvements are needed.  Companies will also use this analysis to see if changes made to the system are beneficial.

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