Lean Six Sigma Green Belt: Measure, Analyze Phases

Study Notes

Lean Six Sigma Green Belt

Measure Phase

Goal: to collect data and define the problem or opportunity
Key activities:
- Define the process and its boundaries
- Identify the key process input variables (KPIVs) and key process output variables (KPOVs)
- Develop a data collection plan
- Collect data and validate the measurement system
Tools and techniques:
- Process mapping
- Swimlane analysis
- Cause-and-effect diagrams
- Gauge R&R (repeatability and reproducibility)

Analyze Phase

Goal: to identify the root causes of the problem and opportunities for improvement
Key activities:
- Analyze the data collected during the Measure phase
- Identify the relationships between KPIVs and KPOVs
- Validate the root causes of the problem
- Develop a preliminary solution
Tools and techniques:
- Regression analysis
- Correlation analysis
- Hypothesis testing
- ANOVA (analysis of variance)

ANOVA (Analysis of Variance)

A statistical technique used to compare means of two or more groups
Purpose: to determine if there is a significant difference between the means of the groups
Key concepts:
- Factors: the variables being studied
- Levels: the different values of the factors
- Treatments: the combinations of factor levels
- F-test: a statistical test used to determine if the means are significantly different
- P-value: the probability of observing the results by chance

DOE (Design of Experiments)

A systematic approach to experimentation and data collection
Purpose: to identify the relationships between variables and to optimize processes
Key concepts:
- Factors: the variables being studied
- Levels: the different values of the factors
- Treatments: the combinations of factor levels
- Runs: the individual experiments
- Response variable: the outcome being measured
Types of DOE:
- Full factorial designs
- Fractional factorial designs
- Plackett-Burman designs
- Taguchi designs

R&R (Repeatability and Reproducibility)

A measure of the variability of a measurement system
Purpose: to evaluate the accuracy and precision of a measurement system
Key concepts:
- Repeatability: the variation in measurements taken by the same operator using the same instrument
- Reproducibility: the variation in measurements taken by different operators using the same instrument
- Gage R&R: a measure of the variability of a measurement system, including both repeatability and reproducibility
Calculation: uses the variance components method to estimate the repeatability and reproducibility of the measurement system

Description

This quiz covers the Measure and Analyze phases of Lean Six Sigma Green Belt certification, including process mapping, regression analysis, and design of experiments. Test your knowledge of key concepts and tools used in these phases.