The journal
Operational excellence, written down.
146 articles and glossary entries on Six Sigma, Lean, DMAIC and the craft of getting certified — searchable, filterable, and free.
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How Long Does It Take to Get Six Sigma Certified?
Realistic Six Sigma certification timelines for working professionals — White, Green and Black Belt — plus the factors that speed you up or slow you down.
Aug 15, 2026 · 5 min
MethodsLean vs. Six Sigma vs. Lean Six Sigma: What’s the Difference?
How Lean, Six Sigma and Lean Six Sigma differ — their origins, what each optimizes for, when to use which, and the misconceptions that blur them.
Aug 8, 2026 · 6 min
Career15 Six Sigma Interview Questions — and How to Answer Them
Fifteen Six Sigma interview questions grouped into concepts, tools and scenarios — each with a short model answer approach you can practice aloud.
Jul 28, 2026 · 6 min
CareerHow to Add a Certification to Your LinkedIn Profile (and Why It Matters)
Exact steps to add a certification to LinkedIn’s Licenses & Certifications section — plus how credential IDs, verification URLs and placement work.
Jul 10, 2026 · 5 min
MethodsThe Seven Wastes: How to Spot Them in Any Process
Transport, inventory, motion, waiting, overproduction, overprocessing, defects — how to spot each of the seven wastes in office and physical work.
Jun 25, 2026 · 6 min
CertificationIs Six Sigma Certification Worth It in 2026?
A balanced look at whether Six Sigma certification pays off in 2026 — where it earns its keep, where it matters less, and how to spot a credible credential.
Jun 8, 2026 · 5 min
CertificationGreen Belt vs. Black Belt: Which Six Sigma Certification Is Right for You?
An honest comparison of Six Sigma Green Belt and Black Belt — role expectations, statistics depth, time and cost, plus a five-minute decision checklist.
May 20, 2026 · 5 min
CertificationHow to Evaluate a Six Sigma Certification Provider
No central body governs Six Sigma certification, so vetting providers is your job. A candid checklist: proctoring, verification, pricing, refund terms.
May 13, 2026 · 5 min
CertificationMaster Black Belt: What It Is and Who Actually Needs One
What a Master Black Belt actually does, how the title is really earned, and an honest look at who needs one — from a provider that does not sell it.
May 9, 2026 · 5 min
CareerSix Sigma and Agile: Rivals or Partners?
Six Sigma and Agile are often cast as rivals. They solve different problems — here is what each optimizes, where they combine, and which to learn first.
May 5, 2026 · 5 min
MethodsDMAIC, Explained: The Five Phases of Every Six Sigma Project
A plain-English walk through Define, Measure, Analyze, Improve and Control — following one slow, error-prone invoice process through all five phases.
May 2, 2026 · 5 min
CareerSix Sigma vs PMP: Which Credential Fits Your Path
Six Sigma and the PMP certify different skills for different careers. What each covers, where they overlap, and how to choose the one that fits your path.
May 1, 2026 · 5 min
MethodsAnatomy of a First DMAIC Project: A Walkthrough
A hypothetical first DMAIC project from charter to control plan — a distribution company tackles mis-picked orders, with lessons for new project leaders.
Apr 28, 2026 · 5 min
FundamentalsWhat Is Six Sigma? A Plain-English Guide
What Six Sigma is, in plain English: where the name comes from, what practitioners actually do, how DMAIC works, and why employers keep asking for it.
Apr 14, 2026 · 5 min
LeadershipHow to Select Improvement Projects Worth Doing
Most improvement programs fail at selection, not execution. Six filters for projects worth chartering — and the doomed candidates to refuse.
Apr 14, 2026 · 5 min
LeadershipCoaching Green Belts: What New Project Leaders Need
The first project decides whether a Green Belt becomes a project leader. What coaches should provide, phase by phase, and the mistakes to avoid.
Apr 10, 2026 · 5 min
LeadershipGetting Executive Buy-In for Improvement Projects
How to win real executive sponsorship: translate defects into business currency, bring a baseline, scope a yes-sized project, and ask for specifics.
Apr 5, 2026 · 5 min
LeadershipBuilding an Improvement Culture That Survives Leadership Changes
Why improvement programs die when their champion leaves, and how to embed the method in daily work so no succession or reorganization can remove it.
Apr 1, 2026 · 5 min
LeanTakt Time, Cycle Time and Lead Time, Untangled
Lead time, cycle time and takt time measure different clocks. Clear definitions, one worked example, and the three comparisons that diagnose any process.
Mar 18, 2026 · 5 min
LeanKanban Basics for Office Work
How kanban moved from Toyota’s signal cards to office boards: visualizing work, limiting WIP, pulling instead of pushing, and reading flow over busyness.
Mar 14, 2026 · 5 min
LeanHow to Run a Waste Walk
A step-by-step guide to the waste walk: how to prepare, what to look for, the etiquette that keeps it honest, and how to turn observations into action.
Mar 9, 2026 · 5 min
LeanA Practical 5S Guide for Offices and Plants
Sort, set in order, shine, standardize, sustain — what each step really asks, how it differs between plants and offices, and why most 5S efforts stall.
Mar 5, 2026 · 6 min
MethodsSample Size Intuition: How Much Data Is Enough?
How much data is enough? The soup principle, the square-root rule of diminishing returns, and the three questions that actually set your sample size.
Feb 23, 2026 · 5 min
MethodsChoosing the Right Chart for Your Data
Run chart, histogram, Pareto or scatter? Match the chart to the question you are asking — and spot the chart types that flatter more than they inform.
Feb 18, 2026 · 5 min
MethodsHypothesis Testing Without Fear: An Intuition-First Guide
Hypothesis testing explained through intuition: the question every test asks, what a p-value really means, and the two errors practitioners must weigh.
Feb 14, 2026 · 6 min
MethodsUnderstanding Variation: The One Idea That Changes How You See Work
Common cause or special cause? Why every metric wobbles, how to tell noise from change, and why the distinction transforms how you manage any process.
Feb 10, 2026 · 6 min
ApplicationsSix Sigma in Nonprofit and Public-Service Operations
Applying Six Sigma where nothing is for sale: defining customers and defects in mission-driven work, DMAIC on thin budgets, and metrics that serve the mission.
Jan 28, 2026 · 5 min
ApplicationsSix Sigma for Remote and Hybrid Operations
Distributed work is a process you never designed. How Six Sigma finds waste in handoffs and queues, and how DMAIC runs when the team shares no room.
Jan 23, 2026 · 5 min
ApplicationsSix Sigma in Startups: When Process Discipline Helps and When It Hurts
An honest look at process discipline in startups — where Six Sigma thinking saves young companies, where it kills speed, and a test for telling the difference.
Jan 19, 2026 · 5 min
ApplicationsSix Sigma for Small Businesses: No Consultants Required
Why Six Sigma works in a ten-person company: right-sizing DMAIC, tools that need only a spreadsheet, and how an owner runs the first project alone.
Jan 15, 2026 · 5 min
CertificationCommon Mistakes on Six Sigma Exams and How to Avoid Them
The recurring, avoidable mistakes on Six Sigma exams — tool-first studying, isolated definitions, pacing collapses — and the habit that prevents each one.
Jan 1, 2026 · 5 min
CertificationHow to Prepare for a Six Sigma Certification Exam
A practical preparation plan for Six Sigma exams: know the format cold, schedule backwards from exam day, drill recall, and make proctoring routine.
Dec 28, 2025 · 5 min
CertificationCan You Self-Study Six Sigma? What Self-Study Can and Cannot Give You
Six Sigma can absolutely be self-studied — up to a point. What books and free material genuinely teach, and where structure, feedback, and proof run out.
Dec 24, 2025 · 5 min
CertificationWhite Belt or Yellow Belt: Choosing Your First Step
White Belt or Yellow Belt first? What each level covers, what it signals to employers, what it costs in hours and dollars — and a five-minute way to decide.
Dec 20, 2025 · 5 min
CareerWhat Hiring Managers Actually Look For in Belt Holders
The certificate starts the conversation. What interviewers probe next: method in your stories, honest scope, trustworthy measurement, and gains that held.
Dec 13, 2025 · 5 min
CareerSix Sigma Roles Inside Organizations: From Team Member to Deployment Leader
A map of the Six Sigma org chart — team member, project leader, Black Belt, Master Black Belt, champion, and deployment leader — and what changes at each seat.
Dec 9, 2025 · 5 min
CareerHow to Put Six Sigma on Your Resume: Placement, Wording, Proof
Where a Six Sigma credential belongs on a resume, how to name it precisely, bullet patterns that use your real numbers, and the mistakes that undo it.
Dec 5, 2025 · 5 min
CareerSix Sigma for Career Changers: Transferring Into Operations
How to move into operations from another field: the process experience you already have, the vocabulary gap that hides it, and a realistic transition plan.
Dec 1, 2025 · 5 min
MethodsRunning Your First Gage R&R Study
Repeatability, reproducibility, and how to design and read your first crossed Gage R&R study — so you can trust your data before you analyze it.
Nov 24, 2025 · 5 min
MethodsHow to Build a Control Plan That Outlives the Project
Why improvements decay and how a control plan prevents it: what to monitor, who owns each response, and how to hand a process back so the gains hold.
Nov 19, 2025 · 5 min
MethodsValue Stream Mapping for Office Processes: A Walkthrough
How to map an office value stream end to end: walking the process, drawing the current state, reading the timeline, and designing the future state.
Nov 14, 2025 · 5 min
MethodsSIPOC in Five Steps: A Practical Guide
How to build a SIPOC map in one working session: the five steps in the right order, a worked example, and the habits that make the exercise decorative.
Nov 10, 2025 · 5 min
MethodsBuilding a Data Collection Plan You Can Defend
How to build a data collection plan that survives scrutiny: operational definitions, data types, sampling, stratification, and piloting before you commit.
Nov 2, 2025 · 6 min
GlossaryWhat Is OEE? Overall Equipment Effectiveness, Explained
OEE multiplies availability, performance, and quality into one percentage showing how much of a machine’s scheduled capacity becomes good product.
Nov 1, 2025 · 2 min
MethodsWriting a Project Charter That Gets Approved
What sponsors actually look for in a Six Sigma project charter: problem and goal statements, scope, business case — and the red flags that get charters sent back.
Oct 28, 2025 · 5 min
GlossaryWhat Is an Audit in Process Improvement?
Audits in process improvement, explained: planned, independent checks that a process still runs as designed — and how they catch drift before customers do.
Oct 28, 2025 · 2 min
GlossaryWhat Does First Pass Yield Mean in Six Sigma?
First pass yield measures the share of units that clear a process step right the first time — no rework, no scrap, and no quiet second attempts counted.
Oct 28, 2025 · 2 min
GlossaryWhat Is Standard Work? Definition and Uses
Standard work, defined: the current best-known way to do a task, documented and followed — the stable baseline that makes every improvement stick.
Oct 25, 2025 · 3 min
MethodsHow to Facilitate a Fishbone Session That Finds Real Causes
How to run a fishbone (Ishikawa) session that produces testable causes instead of a wall of opinions: setup, the right room, ground rules, and follow-through.
Oct 24, 2025 · 6 min
GlossaryWhat Are Non-Parametric Tests? Definition and Uses
Non-parametric tests, defined: rank-based methods for skewed or ordinal data, when to reach for them, and the trade-offs against t-tests and ANOVA.
Oct 24, 2025 · 2 min
GlossaryWhat Are Center Points in a Designed Experiment?
Center points are runs with every factor set midway between low and high. How they detect curvature and drift in two-level factorial experiments.
Oct 24, 2025 · 2 min
GlossaryMistake-Proofing vs. Inspection: What’s the Difference?
Mistake-proofing vs. inspection, explained: one prevents defects, the other finds them afterward. What poka-yoke means and when inspection still earns its keep.
Oct 24, 2025 · 2 min
GlossaryWhat Is Rolled Throughput Yield? Definition and Uses
Rolled throughput yield multiplies first pass yield across every process step, exposing the hidden factory that single-step metrics quietly conceal.
Oct 24, 2025 · 2 min
GlossaryWhat Is a Bottleneck? Definition and Uses
Bottlenecks, defined: the single step that limits a whole process’s throughput — how to find yours, and why improving anywhere else changes nothing.
Oct 22, 2025 · 3 min
GlossaryThe Spaghetti Diagram, Explained
The spaghetti diagram explained: tracing real movement on a floor plan to expose motion and transport waste — with a worked clinic example and drawing rules.
Oct 21, 2025 · 2 min
MethodsHow to Run a Kaizen Event Week
A practical guide to running a five-day kaizen event: picking the target, preparing the ground, the day-by-day agenda, and making the gains stick.
Oct 20, 2025 · 6 min
GlossaryOut-of-Control Signals, Explained
A point beyond the limits is only the most famous out-of-control signal. The runs, trends, and zone rules that reveal special causes — and their false-alarm cost.
Oct 20, 2025 · 3 min
GlossaryWhat Is Statistical Power? Definition and Uses
Statistical power, defined: a test’s ability to detect real effects, why underpowered studies mislead teams, and how power is planned in advance.
Oct 20, 2025 · 2 min
GlossaryOne-Factor-at-a-Time Testing: What It Is and Why It Fails
One-factor-at-a-time testing feels careful but misses interactions, stalls at false optima, and wastes runs. Why OFAT fails and what to use instead.
Oct 20, 2025 · 2 min
GlossaryWhat Is the PDCA Cycle? Definition and Uses
The PDCA cycle, explained: Plan, Do, Check, Act — the small, repeating experiment loop behind nearly every modern improvement method, DMAIC included.
Oct 20, 2025 · 2 min
GlossaryWhat Is Cost of Poor Quality? Definition and Uses
Cost of poor quality translates defects into money: failure, appraisal, and prevention costs — and the hidden factory most ledgers never show.
Oct 20, 2025 · 2 min
GlossaryWhat Is a Baseline Measurement? Definition and Uses
Baseline measurement defined: the before picture every improvement claim is judged against — why it comes first and how to make one defensible.
Oct 18, 2025 · 2 min
GlossaryWhat Is a Value Stream Map? Definition and Uses
What a value stream map shows: work time versus waiting time, material and information flow, and how a current-state map leads to a better future state.
Oct 17, 2025 · 2 min
GlossaryWhat Is a Pull System? Definition and Uses
Pull systems, defined: work starts only when downstream demand signals for it — the Lean alternative to push scheduling and its forecast errors.
Oct 17, 2025 · 3 min
GlossarySample Size, Explained: How Much Data Is Enough?
Sample size, explained: what actually determines how much data you need, why guessing fails, and how Six Sigma teams plan their samples deliberately.
Oct 16, 2025 · 2 min
GlossaryRobust Design, Explained
Robust design chooses settings so output stays good despite uncontrollable variation. The Taguchi idea, a worked example, and practical pointers.
Oct 16, 2025 · 2 min
GlossaryQuick Wins in Six Sigma: What They Are and When to Take Them
Quick wins are the low-risk, obvious fixes that surface early in a project. When to take them, when to wait, and how to bank credibility safely.
Oct 16, 2025 · 2 min
GlossaryWhat Is a Control Plan in Six Sigma?
A control plan documents how an improved process will be monitored after the project ends — metrics, methods, owners, and reaction plans. Here’s what goes in one.
Oct 15, 2025 · 2 min
GlossaryWhat Is a Gemba Walk? Definition and Uses
The gemba walk, explained: why leaders go to where the work actually happens, what to ask and observe, and how it differs from an inspection tour.
Oct 15, 2025 · 2 min
GlossaryCpk, Explained
Cpk defined: the actual capability index that accounts for centering — how it relates to Cp, a worked bottling example, and how to read the gap between them.
Oct 14, 2025 · 2 min
FundamentalsThe Normal Distribution, Explained for Practitioners
What the bell curve really describes, the 68-95-99.7 rule, where 3.4 defects per million comes from, and when practitioners should distrust the curve.
Oct 13, 2025 · 6 min
GlossaryWhat Is a Process Map? Definition and Uses
What a process map is, the levels from SIPOC to swimlane, and a worked onboarding example — plus the rules for mapping what actually happens.
Oct 13, 2025 · 2 min
GlossaryCycle Time vs Lead Time: What’s the Difference?
Cycle time and lead time, untangled: what each one measures, why the gap between them is mostly waiting, and which one your customer actually feels.
Oct 13, 2025 · 3 min
GlossaryWhat Is a Confidence Interval? Definition and Uses
Confidence intervals, defined: the range of plausible values behind every estimate, how to read one honestly, and why the width is the real message.
Oct 12, 2025 · 2 min
GlossaryWhat Is a Run Chart? Definition and Uses
A run chart is the simplest process picture: data in time order around a median line, no control limits. What its patterns mean and when to graduate to more.
Oct 11, 2025 · 2 min
GlossaryWhat Is a Screening Design? Definition and Uses
A screening design is a small experiment that separates the vital few factors from the trivial many before optimization begins. How and when to use one.
Oct 11, 2025 · 2 min
GlossaryWhat Does Benchmarking Mean in Six Sigma?
Benchmarking, explained: the disciplined comparison of your process against a reference — internal, competitive or cross-industry — to set targets on evidence.
Oct 11, 2025 · 2 min
GlossaryWhat Is a Tollgate Review in Six Sigma?
Tollgate reviews are the checkpoints between DMAIC phases where sponsors weigh the evidence and decide to proceed, redirect, or stop the project.
Oct 11, 2025 · 2 min
GlossaryWhat Is Cp? Definition and Uses
Cp defined: the potential capability index — specification width over process spread, what a value of 1.33 means, and why Cp alone can badly mislead.
Oct 10, 2025 · 2 min
FundamentalsTQM vs Six Sigma: What Changed and Why It Stuck
Total Quality Management preached the right beliefs; Six Sigma added structure. What changed between the two movements, and why the stricter one endured.
Oct 9, 2025 · 5 min
GlossaryWhat Does Stratification Mean in Six Sigma?
Stratification explained: why aggregated data hides its own evidence, how layering by shift, machine, or channel reveals causes, and mistakes to avoid.
Oct 9, 2025 · 2 min
GlossaryWhat Is Takt Time? Definition and Uses
Takt time, defined: available working time divided by customer demand — the drumbeat that tells a process exactly how fast it must run to keep pace.
Oct 9, 2025 · 3 min
GlossaryMultiple Regression, Explained
Multiple regression, explained: modeling one output from several inputs at once, reading adjusted coefficients, and avoiding the traps of overfitting.
Oct 8, 2025 · 2 min
GlossaryReplication, Explained: Why Experiments Repeat Themselves
Replication means running the same experimental condition more than once to measure natural process noise. What counts as a true replicate, and why.
Oct 8, 2025 · 2 min
GlossarySampling Methods in Six Sigma, Explained
Sampling methods, explained: random, stratified, systematic and rational subgroup sampling — and how the wrong choice quietly biases everything downstream.
Oct 8, 2025 · 2 min
GlossaryThe CUSUM Chart, Explained
A CUSUM chart accumulates deviations from target so small persistent shifts become visible slopes — and it points to when the shift began. Here’s how.
Oct 7, 2025 · 2 min
GlossaryWhat Is a Process Owner? Definition and Uses
The process owner runs a process day to day and inherits every improvement made to it. What the role involves and why the Control phase depends on it.
Oct 7, 2025 · 2 min
GlossaryWhat Is Process Capability? Definition and Uses
Process capability defined: comparing the voice of the process with the voice of the customer — stability first, then Cp and Cpk, with a worked example.
Oct 6, 2025 · 2 min
GlossaryWhat Does Just-in-Time Mean in Lean?
Just-in-time, defined: producing what is needed, when it is needed, in the amount needed — the Toyota pillar that exposes problems inventory hides.
Oct 6, 2025 · 3 min
FundamentalsDeming, Juran, and the Quality Pioneers Behind Six Sigma
Shewhart’s control charts, Deming’s theory of variation, Juran’s project-by-project improvement — the pioneers whose ideas still power every belt.
Oct 5, 2025 · 5 min
GlossaryThe Scatter Plot, Explained
What a scatter plot is, how to read its patterns, and why correlation is not causation — with a worked cure-oven example and rules for honest reading.
Oct 5, 2025 · 2 min
GlossaryWhat Is an EWMA Chart? Definition and Uses
The EWMA chart weights recent history into every plotted point, catching small sustained shifts that Shewhart charts miss. How it works and when to use it.
Oct 3, 2025 · 2 min
GlossaryWhat Is Simple Regression? Definition and Uses
Simple linear regression, defined: fitting a line that predicts an output from one input, reading the slope and R-squared, and avoiding common misuse.
Oct 3, 2025 · 2 min
GlossaryWhat Is Blocking in Design of Experiments?
Blocking groups experimental runs by a known nuisance variable — batch, day, machine — so its effect can be separated from the factors under study.
Oct 3, 2025 · 2 min
GlossaryWhat Is a Data Collection Plan? Definition and Uses
The data collection plan, explained: what to measure, how, by whom, how often and on what sample — all decided before the first data point exists.
Oct 3, 2025 · 2 min
GlossaryChampion and Sponsor Roles in Six Sigma, Explained
What champions and sponsors actually do in Six Sigma: selecting projects, signing charters, clearing obstacles, and owning results when the belts go home.
Oct 3, 2025 · 2 min
FundamentalsThe History of Six Sigma: From Motorola to Today
How Six Sigma grew from a crisis at Motorola in 1986 into a global standard — through GE and the belt system to today’s Lean Six Sigma programs.
Oct 1, 2025 · 5 min
GlossaryWhat Does Sigma Level Mean?
Sigma level defined: how the sigma scale scores a process’s defect rate, the 1.5-sigma shift convention, and what each step up the ladder really means.
Oct 1, 2025 · 2 min
GlossaryWhat Is a Box Plot? Definition and Uses
The box plot explained: medians, quartiles, whiskers, and outliers — and why side-by-side boxes are the fastest honest way to compare groups of data.
Oct 1, 2025 · 2 min
GlossaryWhat Is Poka-Yoke? Definition and Uses
Poka-yoke, defined: mistake-proofing — designing tasks and tools so errors are impossible or instantly obvious, an idea popularized by Shigeo Shingo.
Oct 1, 2025 · 3 min
GlossaryWhat Is Randomization in a Designed Experiment?
Randomization runs experimental trials in random order so drifting conditions cannot impersonate factor effects. Why it matters and how to do it.
Sep 30, 2025 · 2 min
GlossaryControl Limits vs. Specification Limits: What’s the Difference?
Control limits describe what a process does; specification limits what the customer accepts. How to tell them apart, and why confusing them is costly.
Sep 29, 2025 · 2 min
GlossaryWhat Does Correlation Mean in Six Sigma?
Correlation, defined: what the correlation coefficient measures, how Six Sigma teams use it to screen suspected causes, and the classic traps to avoid.
Sep 29, 2025 · 2 min
GlossaryWhat Is an Operational Definition?
Operational definitions, explained: how to describe a measurement so precisely that two people counting the same thing arrive at the same number.
Sep 29, 2025 · 2 min
GlossaryWhat Is Stakeholder Analysis? Definition and Uses
Stakeholder analysis maps who a project affects, how much influence they hold, and what each needs to support the change — before resistance surprises you.
Sep 29, 2025 · 2 min
GlossaryWhat Is DPMO? Definition and Uses
DPMO defined: defects per million opportunities — the formula, why opportunities matter, a worked calculation, and the mistakes that corrupt the number.
Sep 27, 2025 · 2 min
GlossaryWhat Is 5S? Definition and Uses
5S, defined: Sort, Set in order, Shine, Standardize, Sustain — the workplace organization method that makes problems visible before they become incidents.
Sep 27, 2025 · 3 min
GlossaryWhat Is a Histogram? Definition and Uses
What a histogram shows that an average hides: the shape, spread, and center of a process — with a worked delivery-time example and common reading mistakes.
Sep 26, 2025 · 2 min
GlossaryWhat Does Interaction Effect Mean in Six Sigma?
An interaction effect means one factor’s influence depends on another’s setting. What interactions are, how to read them, and why OFAT misses them.
Sep 26, 2025 · 2 min
GlossaryWhat Is a Chi-Square Test? Definition and Uses
The chi-square test, defined: how Six Sigma teams test count data — defects by shift, errors by type — for patterns too strong to be chance.
Sep 25, 2025 · 2 min
GlossaryWhat Is Measurement System Analysis (MSA)?
Measurement system analysis, explained: the checkpoint that qualifies your data — bias, stability, linearity, resolution and agreement — before you trust it.
Sep 25, 2025 · 2 min
GlossaryWhat Does Special Cause Variation Mean in Six Sigma?
Special cause variation comes from a specific, findable source outside a process’s normal system. How to spot it on a chart and what to do when you have.
Sep 24, 2025 · 2 min
GlossaryWhat Is Kanban? Definition and Uses
Kanban, defined: the visual signal system that controls work in progress — from Toyota’s card-and-bin system to the boards software teams use today.
Sep 24, 2025 · 3 min
GlossaryScope Creep, Explained
Scope creep is the quiet expansion of a project beyond its charter. What causes it, the warning signs, and how charters and tollgates contain it.
Sep 24, 2025 · 2 min
GlossaryDefect vs. Defective: What’s the Difference?
Defect vs. defective in Six Sigma: one counts failures, the other counts failed units — why the difference changes your metrics, with a worked example.
Sep 23, 2025 · 2 min
GlossaryWhat Is a Check Sheet in Six Sigma?
What a check sheet is and why data collection decides project quality — with a worked print-shop example and rules for designing sheets that get used.
Sep 22, 2025 · 2 min
GlossaryWhat Is Response Surface Methodology? Definition and Uses
Response surface methodology (RSM) maps the curved link between settings and output to locate an optimum. Definition, worked example, and pitfalls.
Sep 22, 2025 · 2 min
GlossaryWhat Is Gage R&R? Definition and Uses
Gage R&R, explained: the study that reveals how much of your data’s variation comes from the measurement system itself — and what to do when it fails.
Sep 22, 2025 · 2 min
GlossaryCommon Cause Variation, Explained
Common cause variation is the routine, built-in variation of a stable process. Why it has no single culprit, and why reacting to it point by point backfires.
Sep 20, 2025 · 2 min
GlossaryANOVA, Explained: Comparing More Than Two Averages
ANOVA, explained: how analysis of variance compares three or more group averages in one test, why it beats repeated t-tests, and where teams go wrong.
Sep 20, 2025 · 2 min
GlossaryWhat Is a Problem Statement in Six Sigma?
How to write a Six Sigma problem statement: observable, measurable, and free of causes and solutions — with a worked example and common mistakes.
Sep 20, 2025 · 2 min
GlossaryVoice of the Customer, Explained
Voice of the Customer defined: how Six Sigma captures what customers need, the main VOC channels, and how raw statements become measurable requirements.
Sep 19, 2025 · 2 min
GlossaryWhat Is Kaizen? Definition and Uses
Kaizen, defined: continuous improvement through small, daily changes made by the people who do the work — plus how kaizen events focus that energy.
Sep 19, 2025 · 3 min
GlossaryWhat Is Root Cause Analysis? Definition and Uses
Root cause analysis, explained: symptoms versus causes, the tools of the search, a worked claims example, and how to verify a cause before funding a fix.
Sep 18, 2025 · 2 min
GlossaryFractional Factorial Designs, Explained
Fractional factorial designs run a chosen fraction of the full experiment, trading rarely-needed interactions for far fewer runs. How aliasing works.
Sep 18, 2025 · 2 min
GlossaryWhat Is a Risk Priority Number (RPN)?
The risk priority number, explained: how severity, occurrence and detection multiply into a 1-to-1,000 score, what it ranks well, and where it misleads.
Sep 18, 2025 · 2 min
GlossaryWhat Does a c-Chart Measure in Six Sigma?
A c-chart tracks the count of defects per constant inspection unit — not defective units. When to use it, how it differs from a p-chart, and a worked example.
Sep 16, 2025 · 2 min
GlossaryWhat Is a T-Test? Definition and Uses
The t-test, defined: how Six Sigma practitioners compare two averages, the three variants that matter, and the mistakes that quietly invalidate results.
Sep 16, 2025 · 2 min
GlossaryThe Seven Wastes (Muda), Explained
Muda, defined: the seven classic wastes of Lean — transport, inventory, motion, waiting, overproduction, overprocessing, and defects — with examples.
Sep 16, 2025 · 3 min
GlossaryWhat Is a Project Charter? Definition and Uses
The project charter is the one-page, sponsor-signed document that authorizes a Six Sigma project — what it contains, why it matters, and common mistakes.
Sep 16, 2025 · 2 min
GlossaryWhat Does CTQ Mean in Six Sigma?
CTQ (critical to quality) defined: how customer needs become measurable requirements with targets and limits, plus a worked CTQ-tree example.
Sep 15, 2025 · 2 min
GlossaryThe 5 Whys, Explained
How the 5 Whys works, where the technique came from, and a worked example — plus the discipline that separates root causes from convenient answers.
Sep 14, 2025 · 2 min
GlossaryWhat Is a Full Factorial Design? Definition and Uses
Full factorial designs test every combination of factor levels, capturing every main effect and interaction. Definition, worked example, and pointers.
Sep 14, 2025 · 2 min
GlossaryWhat Is FMEA? Definition and Uses
FMEA, explained: how teams list what could go wrong, score severity, occurrence and detection, and fix the worst risks before a customer meets them.
Sep 14, 2025 · 2 min
GlossaryWhat Is a p-Chart? Definition and Uses
A p-chart tracks the proportion of defective units over time — the control chart for pass-fail data. What it shows, when to use it, and common mistakes.
Sep 12, 2025 · 2 min
GlossaryWhat Does the P-Value Mean in Six Sigma?
The p-value, explained without mysticism: what it actually measures, how Six Sigma teams use it in the Analyze phase, and the misreadings to avoid.
Sep 12, 2025 · 3 min
GlossaryWhat Is Lean? Definition and Uses
Lean, defined: a system for maximizing customer value while eliminating waste. Its Toyota origins, its five core principles, and where to learn it.
Sep 12, 2025 · 3 min
GlossaryWhat Is SIPOC? Definition and Uses
SIPOC defined: the one-page process map of Suppliers, Inputs, Process, Outputs, Customers — how to build one and why it settles scope arguments.
Sep 10, 2025 · 2 min
GlossaryWhat Is a Fishbone (Ishikawa) Diagram? Definition and Uses
The fishbone (Ishikawa) diagram explained: how cause-and-effect branches work, a worked bakery example, and the habits that keep the tool honest.
Sep 10, 2025 · 2 min
GlossaryWhat Is Design of Experiments (DOE)? Definition and Uses
Design of experiments (DOE) defined: how planned, multi-factor experiments reveal which process inputs matter, with a worked example and common mistakes.
Sep 10, 2025 · 2 min
GlossaryX-bar and R Charts, Explained
X-bar and R charts monitor a continuous measurement in small subgroups — one chart for the process center, one for its spread. Here’s how the pair works.
Sep 8, 2025 · 2 min
GlossaryWhat Is Hypothesis Testing? Definition and Uses
Hypothesis testing, defined: how Six Sigma teams use null and alternative hypotheses, significance levels and p-values to separate real change from noise.
Sep 8, 2025 · 3 min
GlossaryWhat Is DMADV? Definition and Uses
DMADV defined: the Design for Six Sigma roadmap — Define, Measure, Analyze, Design, Verify — when to use it instead of DMAIC, with a worked example.
Sep 6, 2025 · 3 min
GlossaryWhat Is a Pareto Chart? Definition and Uses
What a Pareto chart is, how the 80/20 idea actually works, and how to read one — with a worked returns example and the mistakes that mislead teams.
Sep 6, 2025 · 2 min
GlossaryWhat Is a Control Chart? Definition and Uses
A control chart plots a process metric over time against calculated limits, separating routine variation from real change. Here’s how to read one.
Sep 4, 2025 · 3 min
GlossaryWhat Is DMAIC? Definition and Uses
DMAIC defined: the five-phase Six Sigma roadmap — Define, Measure, Analyze, Improve, Control — what each phase asks, and the mistakes that break it.
Sep 2, 2025 · 3 min