Safety Stock Sample Sampling Sampling Distribution Sampling Unit Scatter Plot Screening Design Set-Up Time Reduction Shewhart, Walter A. Sigma Sigma Level Sigmaphobia Significance Level (alpha) Simpson's Paradox Simulation SIPOC Six Sigma Skewness SMED Sparsity of Effects SPC Special Cause Variation Specification Sponsor Stakeholders Standard Deviation Standard Error Standardized Work Statistical Process Control Stochastic Stochastic Simulation Strata Stratification Sum Of Squares Synchronous Learning System Dynamics Systems Diagrams Systems Thinking