Processes in manufacturing and service organizations are regularly improved upon for better operational performance. Six sigma is one of the management philosophies required to achieve improved quality and process performance in systems. Consequently, this study aims to investigate the existing literature focused on six sigma philosophies in process industries and exposition on the future of six sigma approach in manufacturing. For the first time, this research focused on the recommendation of the fourth industrial revolution for process improvement and offer foreseeable decisions in every phase of the six sigma technique. Other aspects covered in this review include six sigma developments, metrics and capabilities, six sigma and quality management approaches; Six sigma integration and innovation; Six sigma and organizational sustenance and benefits of six sigma philosophies; confrontational concerns on six sigma Improvement Strategies and the future of six sigma. Future research directions focused on the six sigma philosophy and innovative technologies to support philosophy have been highlighted with effective recommendations.

Keywords: Six sigma techniques, hybrid philosophies, six sigma improvement strategies