Which measure is a principle aspect of Six Sigma?

The principle aspect of Six Sigma is maintaining a maximum of 3.4 defects per million opportunities. This specific metric embodies the core goal of Six Sigma, which is to enhance process quality by reducing defects and variability. The methodology focuses on identifying and eliminating the causes of errors and improving the overall efficiency in business and manufacturing processes. Achieving this standard indicates a process that operates at a level of near perfection, thereby minimizing waste and optimizing performance.

Other options, such as reducing marketing costs, ensuring compliance with regulations, or increasing production volume, may be beneficial business strategies but do not define the essence of Six Sigma. The methodology is primarily concerned with quality improvement and defect reduction, which is clearly illustrated by the target of 3.4 defects per million opportunities. Thus, this measure is a critical component of the Six Sigma framework.