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Six Sigma

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How to Mistake Proof with Poka Yoke in Six Sigma

Mistake-proofing, or Poka-Yoke (pronounced POH-kuh YOH-kay) as it’s known in Japan, is an action you take in Six Sigma to remove or significantly lower the opportunity for an error or to make the error [more…]

How to Implement a Control Chart for Six Sigma

The primary SPC tool for Six Sigma is the control chart— a graphical tracking of a process input or an output over time. In the control chart, these tracked measurements are visually compared to decision [more…]

How to Use Control Charts to Keep Six Sigma Improvements on Track

If you apply control charting as a part of your Six Sigma process control plan, you can use the control chart itself to trigger action or to leave things as they are based on what the control chart tells [more…]

Process Intelligence Tools to Interpret Results for Six Sigma

Process intelligence tools give you all the information you need to understand what’s happening with process behavior and performance in a Six Sigma Initiative. These tools are vitally important because [more…]

How to Define a Six Sigma Project

When defining a project, you get into the nuts and bolts of Six Sigma. Doing this step right is well worth your time because 50 percent of your project’s success depends on how well it’s defined! [more…]

Brainstorming Tools for a Six Sigma Initiative

At this point in your Six Sigma project, the intent of your brainstorming is to generate and capture a list of possible factors (the Xs) that may be influencing the key output [more…]

Six Sigma Failure Mode Effects Analysis

Failure mode effects analysis (FMEA) is a tool you can use in Six Sigma to quantify and prioritize risk within a process, product, or system and then track actions to mitigate that risk. It’s valuable [more…]

Failure Modes in FMEA for a Six Sigma Initiative

FMEA can be very valuable for identifying failure modes in a Six Sigma Initiative. After scoring the severity of the possible effects, your cross-functional FMEA team brainstorms potential causes of the [more…]

What is Statistical Distribution in Six Sigma?

Distribution is the statistical term that describes the relative likelihood of observing values for a variable factor. When you think of a Six Sigma initiative and the critical performance characteristics [more…]

How to Construct and Interpret a Multi Vari Chart for a Six Sigma Initiative

You don’t have to wait until your multi-vari data are collected to start creating the multi-vari chart for Six Sigma. Instead, you can build the chart, incrementally, adding more to it as you collect more [more…]

What is Short Term Variation in Six Sigma?

When enacting a Six Sigma initiative, you will undoubtedly encounter short term variation. Short-term variation is purely random. Like rolling a pair of dice, you can’t predict what the next output value [more…]

What is Long Term Variation in Six Sigma?

You will need to understand long term variation to launch a successful Six Sigma initiative. When underlying disturbances are added to the natural short-term variation, the overall combination is called [more…]

How to Create and Interpret Dot Plots and Histograms in a Six Sigma Project

Both dot plots and histograms give you lots of information about the variation of a critical characteristic in a process for a Six Sigma initiative. A [more…]

How to Create and Interpret Box and Whisker Plots for a Six Sigma Project

Like putting two people back-to-back to see who’s taller, Sigma Six uses box and whisker plots (or just box plots) to directly compare two or more variation distributions. When you need to compare value [more…]

How to Draw Correlations from Scatter Plots in Six Sigma Analysis

A scatter plot tells you graphically how two characteristics are related, or correlated in a Six Sigma initiative. You can then use this correlation information to explore which factors and outputs affect [more…]

How to Use the Central Limit Theorem for Six Sigma

What happens when you take repeated samples from the same population? This idea is important when you use the central limit theorem for Six Sigma. Imagine flipping a coin ten times and counting the number [more…]

How to Use the Confidence Intervals for Six Sigma

Because samples are accessible, samples and confidence intervals are the primary data tool for understanding a business or processing Six Sigma performance situations. But samples can never give you an [more…]

How to Use the Confidence Intervals for Proportions in Six Sigma

Sometimes in a Six Sigma project, you will be faced with confidence intervals and proportions. When you calculate the number of successes out of a certain number of attempts — like “four out of five dentists [more…]

What You Should Know about 2k Experimentation for Six Sigma

2k full factorial experiments give you a powerful jump-start into the world of improvement through DOE for Six Sigma projects. But really, they’re just the tip of the iceberg. As you gain experience, you [more…]

How to Set Standards for Six Sigma

Taking measures for Six Sigma projects to enable and encourage a process to follow a standard — a standard sequence, a standard method of handling, a standard set of equipment settings, and so on — must [more…]

How to Detect Patterns in Control Charts for Six Sigma

Besides control chart points that lie beyond the control limits in Six Sigma, other visual patterns can tell you that something out of the ordinary is happening to your process. These other patterns also [more…]

How to Collect Data for Control Charts for Six Sigma

You must collect data for control charts for Six Sigma projects in a way that avoids a distorted or inaccurate view of the process performance — whether overly optimistic or too bleak. Using rational subgroups [more…]

How to Make Control Charts for Attribute Data for Six Sigma

In Six Sigma initiatives, you can make control charts for attribute data. Attribute data is data that can’t fit into a continuous scale but instead is chunked into distinct [more…]

What is Six Sigma?

It’s okay if you don’t know what Six Sigma is at all, or don’t understand every aspect of it. That’s because Six Sigma — once a precise, narrowly-defined term — has grown over time to represent a number [more…]

The Managerial Perspective of Six Sigma

Six Sigma action occurs on two levels: the managerial and the technical. At the managerial level, a Six Sigma initiative includes many units, people, technologies, projects, schedules, and details to be [more…]


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