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Chapter 12 of the Green Belt handbook covers the Define phase of DMAIC. You will write a project charter, agree ground rules, map stakeholders, set the edges of the project with the In and Out of the Box method, test the issue with an Is/Is Not matrix, and check readiness at the Define tollgate.

Define: Charter, Stakeholders and Scope

Chapter 13 of the Green Belt handbook covers the Measure phase, often the longest phase of a DMAIC project. You will rate risks with an FMEA, choose the right kind of data, check that your measurement system can be trusted, sample correctly and draw a baseline run chart.

Measure: FMEA, Data, Measurement Systems and Baselines

Chapter 14 of the Green Belt handbook covers the Analyse phase. You will run a fishbone session, record how each cause was verified, drill down with a Pareto chart, read a box plot and see where hypothesis tests, regression and designed experiments fit.

Analyse: Root Causes, Pareto Drill-Down and Box Plots

Chapter 15 of the Green Belt handbook covers the Improve phase. You will rank solutions in a selection matrix, work out payback and net present value, run a pilot, and plan the rollout with documentation, training and handover.

Improve: Solutions Matrix, Cost-Benefit, Pilots and Rollout

Chapter 16 of the Green Belt handbook covers the Control phase. You will revise the FMEA, write a control plan, use visual management, read control charts with the eight tests, tell control from capability, and finish the project well.

Control: Control Plans, Control Charts and Capability

Chapter 17 of the Green Belt handbook covers intermediate graphical analysis. You will pick the simplest chart that answers the question, read bar, pie and scatter charts, build an X-bar control chart by hand in Excel, and switch on the Analysis ToolPak.

Graphs: Choosing the Right Chart and Building a Control Chart

Chapter 18 of the Green Belt handbook covers probability and the normal distribution. You will learn the difference between describing and inferring, work out simple probabilities, read histograms, test whether data look normal, and use Excel to find probabilities and values.

Normal Distributions: Probability, Histograms and the Bell Curve

Chapter 19 of the Green Belt handbook covers correlation and regression. You will read the correlation coefficient, use Excel to find it, fit a line to predict results, and work backwards from a target to the input setting you need.

Correlation and Regression: Linking Inputs to Results

Chapter 20 of the Green Belt handbook covers distributions other than the normal. You will meet the exponential, lognormal and Weibull shapes for continuous data, then the binomial, Poisson and geometric shapes for counts, and see how the Central Limit Theorem lets you use normal methods on large samples.

Non-Normal Distributions: Binomial, Poisson and Other Shapes

Chapter 21 of the Green Belt handbook covers hypothesis testing. You will state a null and an alternative, set the risk of a wrong call, pick a test for your data, read a p-value, and explain the result in plain words.

Hypothesis Testing: Is the Difference Real?

Chapter 22 of the Green Belt handbook covers sample size. You will see how sample size links to margin of error and to the two kinds of wrong call, learn the five inputs a calculation needs, set sensible values for each, and read a power table.

Sample Size: How Much Data Is Enough?

Chapter 23 of the Green Belt handbook covers advanced control charts. You will choose between X-bar and R, X-bar and S, I-MR, p, np, u and c charts, run them in software, read the signals, and tell common cause from special cause.

Control Charts: Choosing and Reading the Right Chart

Chapter 24 of the Green Belt handbook covers statistics for business. You will learn why statistics are hard to present, how to tie each chart to the project goal, how to speak to different audiences, how to build a clear slide, and how to avoid misusing your tools.

Presenting Statistics: Telling the Story to Decision Makers

Forty exam-style questions across the thirteen Green Belt topics, a 70 per cent pass mark, a guide to where to revise, and a set of PDF templates for real projects.

Green Belt Mock Exam and Template Pack

The official Green Belt manual, our study guide, case studies and project templates in one place. Read each item on the page or download it.

Green Belt Library: Manual, Study Guide, Cases and Templates

A Lean Six Sigma Green Belt study path in fourteen short modules. Work through Define, Measure, Analyse, Improve and Control, then the statistics behind them, with practice questions, crosswords, a 40-question mock exam and six PDF templates. Lean and sustainability sit alongside the statistics throughout. By invitation only.

Lean Six Sigma Green Belt: Data‑Led Sustainable Improvement