This book presents a new method of integrating theory of constraints (TOC), lean and Six Sigma into one improvement process. The acronym for this new process is TLS. Piratesh and Fox suggest that companies first use TOC to determine where to focus improvement efforts. Then, based on these priorities, use lean to identify and eliminate the causes of these wastes. Finally, to stabilize the processes and achieve desired statistical control for sustainability, use Six Sigma tools. Combining these three powerful improvement philosophies, tools and techniques into one effective system can produce four times more benefits per project, with less effort, according to the authors.
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