https://sixsigmacenter.com/blog Practical statistics, SPC, process capability and Lean Six Sigma articles from Fred Stevens, founder of Six Sigma Center. en-us © 2026 Six Sigma Center, LLC. All rights reserved. Sat, 31 Oct 2026 17:28:41 GMT https://sixsigmacenter.com/icons/app-icon-512.png https://sixsigmacenter.com/blog https://sixsigmacenter.com/blog/process-playground-see-statistics-move https://sixsigmacenter.com/blog/process-playground-see-statistics-move Free, no sign-in: move one setting and watch control limits, Cpk, Gage R&R, p-values and fit recalculate live across all eight analyses. Sat, 31 Oct 2026 17:28:41 GMT Fred Stevens Fundamentals Platform https://sixsigmacenter.com/blog/thousands-of-tests-trust-every-number-six-sigma-center https://sixsigmacenter.com/blog/thousands-of-tests-trust-every-number-six-sigma-center How Fred Stevens uses 2,000+ automated checks and 300+ manual checks to examine Six Sigma Center calculations, workflows, charts and reports. Sun, 04 Oct 2026 23:35:41 GMT Fred Stevens Platform Updates https://sixsigmacenter.com/blog/six-sigma-center-connector-run-quality-analysis-inside-ai-assistants https://sixsigmacenter.com/blog/six-sigma-center-connector-run-quality-analysis-inside-ai-assistants Run control chart, capability, measurement system, hypothesis, experiment and stack-up analysis from ChatGPT or Claude, on traceable engines. Wed, 19 Aug 2026 17:12:57 GMT Fred Stevens Platform Updates https://sixsigmacenter.com/blog/tolerance-stack-up-analysis-fundamentals-worst-case-rss-monte-carlo https://sixsigmacenter.com/blog/tolerance-stack-up-analysis-fundamentals-worst-case-rss-monte-carlo How worst case, RSS, and Monte Carlo tolerance stack-up differ, and the five failure modes that turn in-spec parts into assemblies that bind. Mon, 27 Jul 2026 15:55:23 GMT Fred Stevens Fundamentals Design & Tolerance https://sixsigmacenter.com/blog/who-six-sigma-center-helps-quality-and-process-teams https://sixsigmacenter.com/blog/who-six-sigma-center-helps-quality-and-process-teams The 14 role categories Six Sigma Center is built for, with the exact analysis module workflow and audit-ready report artifact each one uses. Mon, 27 Jul 2026 07:23:55 GMT Fred Stevens Methodology Guides Platform https://sixsigmacenter.com/blog/founding-user-data-review-spc-capability https://sixsigmacenter.com/blog/founding-user-data-review-spc-capability Send one anonymized process dataset and receive a founder-performed SPC and capability report, walkthrough, and 30 days Pro access in 24 to 48 hours. Wed, 24 Jun 2026 14:47:04 GMT Fred Stevens Methodology Guides Case Studies https://sixsigmacenter.com/blog/voices-of-lean-six-sigma-product-development-npi https://sixsigmacenter.com/blog/voices-of-lean-six-sigma-product-development-npi Map all 20 Lean Six Sigma Voices of (VOC, VOP, VOD, VoEng, VOS, VOR + 14 more) to DMAIC, NPI gates, and analytics that prove a process can deliver. Sat, 09 May 2026 05:45:57 GMT Fred Stevens Methodology Fundamentals Product Development & NPI https://sixsigmacenter.com/blog/voice-of-customer-vs-voice-of-process-voc-vop https://sixsigmacenter.com/blog/voice-of-customer-vs-voice-of-process-voc-vop Learn the critical difference between VOC and VOP. See how specification limits, control limits, and Cpk bridge customer needs to process reality. Sun, 15 Feb 2026 00:00:00 GMT Fred Stevens Process Capability Fundamentals https://sixsigmacenter.com/blog/doe-vs-ofat-factorial-interactions-explained https://sixsigmacenter.com/blog/doe-vs-ofat-factorial-interactions-explained DOE beats OFAT testing by detecting factor interactions. Learn why factorial designs find effects that one-factor-at-a-time testing misses. Mon, 29 Dec 2025 21:41:43 GMT Fred Stevens Design of Experiments Fundamentals https://sixsigmacenter.com/blog/process-capability-cp-vs-cpk-explained https://sixsigmacenter.com/blog/process-capability-cp-vs-cpk-explained Learn the differences between Cp and Cpk process capability indices. Understand formulas, interpretation, and when to use each metric for quality improvement. Sat, 06 Dec 2025 17:09:17 GMT Fred Stevens Process Capability Fundamentals https://sixsigmacenter.com/blog/introduction-to-spc-control-charts https://sixsigmacenter.com/blog/introduction-to-spc-control-charts Complete guide to statistical process control charts. Learn when to use I-MR, X-bar R, P-charts, and other SPC tools for effective process monitoring. Thu, 04 Dec 2025 17:09:17 GMT Fred Stevens SPC Fundamentals Tutorials https://sixsigmacenter.com/blog/six-sigma-dmaic-methodology-guide https://sixsigmacenter.com/blog/six-sigma-dmaic-methodology-guide Complete guide to DMAIC: Define, Measure, Analyze, Improve, Control. Learn tools, techniques, and deliverables for each phase of Six Sigma projects. Mon, 01 Dec 2025 17:09:17 GMT Fred Stevens Methodology Fundamentals https://sixsigmacenter.com/blog/introduction-to-hypothesis-testing https://sixsigmacenter.com/blog/introduction-to-hypothesis-testing Master hypothesis testing with guidance on t-tests, ANOVA, and p-values. Learn test selection and result interpretation. Fri, 28 Nov 2025 00:00:00 GMT Fred Stevens Fundamentals Statistical Analysis https://sixsigmacenter.com/blog/predictive-modeling-regression-guide https://sixsigmacenter.com/blog/predictive-modeling-regression-guide Master predictive modeling and regression with guidance on model building, validation, and interpretation. Mon, 10 Nov 2025 00:00:00 GMT Fred Stevens Statistical Analysis Tutorials https://sixsigmacenter.com/blog/gage-rr-measurement-system-analysis-guide https://sixsigmacenter.com/blog/gage-rr-measurement-system-analysis-guide Master Gage R&R and MSA with guidance on %GRR thresholds and NDC interpretation. Build trustworthy measurements. Tue, 04 Nov 2025 00:00:00 GMT Fred Stevens Fundamentals Measurement System Analysis