What is the difference between control limits and specification limits?

Conceptually, what does the notion of process capability represent?

Know how to determine a process capability index, C_p from a set of data. Is a higher or lower index desirable? Why? What is the typical benchmark value for C_p?

What does the term "six-sigma" mean? Where did it originate? Be able to discuss why six-sigma levels of performance are desirable—including a mention of processes that would perform poorly at levels much lower than six-sigma.

What are the steps in instituting a quality control program?