Which of the following requires “voice of the customer” and “voice of the process” to...

The correct answer is A. Process capability . The CSSBB supplemental material states this directly: process capability involves comparing the voice of the customer with the voice of the process . It also shows the capability relationship as Cp, Pp = (USL − LSL) / 6S = Voice of the Customer / Voice of the Process . In Six Sigma terms, the voice of the customer is reflected in specification limits or customer requirements, while the voice of the process is reflected in the actual variation and centering of the process.

This comparison is what tells a Black Belt how well the process can meet customer expectations. A process may be in statistical control yet still not be capable of meeting specs. The CSSBB material also notes that measuring process capability is the best method to ensure a quantifiable understanding of how much customer requirements are being met. Process control focuses on stability over time, QFD translates customer needs into design characteristics, and TOC focuses on constraints and flow. Therefore, the correct CSSBB answer is process capability .