Six-Sigma is a powerful business strategy that employs a disciplined approach to tackle process variability using the application of statistical and non-statistical tools and techniques in a rigorous manner. The process quality of six-sigma corresponds to a defect rate of at most 3.4 parts per million (ppm). The applications of six-sigma will continue to grow in the forthcoming years. The six-sigma concept of process capability indices such as C_p, C_pk, C_pm, and C_pmk have been considered in this research. It provides quantitative measures of process potential and performance. Moreover, based on the “sigma level” the various competitive levels have been categorized as world class, industry average, and non-competitive industry. It aims to identify the firm performance within these three competitive levels at the four process capability indices and see the consequences of these indices. Further, it does provide good understanding and foundation for future research. The practitioners and researchers can use the procedure to test whether the processes meet the capability requirement. We plan to undertake on the vast study to verify the framework given in the paper.