Probability and Statistics Cookbook

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The cookbook contains a succinct representation of various topics in probability theory and statistics. It provides a comprehensive reference reduced to the mathematical essence, rather than aiming for elaborate explanations. » Download the Probability and Statistics Cookbook Probability and Statistics Cookbook Screenshots

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News Roundup: New Book on UCLA Health System’s Operational Excellence Journey; Black Belt Milstead Becomes VP at HealthAmerica

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Recent news from Lean Six Sigma use in healthcare includes the release of a new book detailing UCLA Health System’s path to operational excellence and the appointment of a Black Belt to a leadership role within a health insurance organization.

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Problem Solving Methodology Wizard Flow Chart

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This flow chart for the Problem Solving Methodology Wizard will guide you through the process of determining the most appropriate problem solving methodology for your process.

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Call vs. Online Chat: Switching Volume from One Channel to Another

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An iSixSigma Discussion Forum exchange involved the manager of a call center who was interested in eliminating her organization’s “online chat” channel of communication and have all contact flow through the phones instead. However, she wanted to see if she could make an apples-to-apples comparison between the online chat and phone channels, given that they […]

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Managing Performance Factors: A Sample Checklist

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In the May/June issue of iSixSigma Magazine, the article, “Taking the Next Step: How to Eliminate Errors for Good,” offers an approach for managing human performance factors in an effort improve processes in service organizations. An excerpt of a checklist used to measure human performance factors and gauge risk is featured in the magazine article. […]

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Catching Up with iSixSigma’s Editorial Advisory Family

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The holiday season is a time when people count their blessings, celebrate the warmth of family and look forward to a fresh start to the new year. The same holds true at iSixSigma, on both a personal and professional level.

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Table of the Standard Normal (z) Distribution

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Z score is a measure of the distance in standard deviations of a sample from the mean. It is calculated as (X – X bar) / sigma. The table of z distribution is shown below. Table of the Standard Normal (z) Distribution z 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.0 0.0000 […]

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Biography: Dr. Mikel Harry

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Read Dr. Mikel Harry’s responses to common questions about Six Sigma. His biography is below: Ph.D., Arizona State University, 1984 M.A., Ball State University, 1981 B.S., Ball State University, 1973 Dr. Harry has been widely recognized and cited in many publications as the principal architect of Six Sigma and the world’s leading authority within this […]

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Linking Quality to Finances

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The Quality profession has always been about improving processes, products and services. From TQM to PDCA to Six Sigma, all Quality methodologies are focused on eliminating defects and the root causes of those defects. It involves products that satisfy your customers, running processes at greater efficiencies, producing less waste and increasing business productivity. All of […]

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Why Choose Six Sigma Over Kaizen?

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Message: 8897 Posted by: Carlos Castillo Posted on: Tuesday, 29th January 2002 What are the benefits of choosing 6sigma over Kaizen, 6 sigma seems a great deal more expensive and more bureucratic. I have obtained great gains from Kiazen with minimal investment. Message: 8899 Posted by: mn Posted on: Tuesday, 29th January 2002 ——————————————————————————– I […]

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Six Sigma Versus Lean

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Message: 16306 Posted by: Eric Posted on: Thursday, 25th July 2002 My company is actively deploying Lean Mfg principles. To this point, we have not been heavily involved with Six Sigma. Although recently our Customers have heightened our awareness of Six Sigma by asking/ requiring us to participate in their Six Sigma efforts – including […]

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Six Sigma Versus TQM

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Message: 15934 Posted by: Tim Posted on: Wednesday, 17th July 2002 ——————————————————————————– Hi, I am writing my thesis about Six Sigma and try to compare TQM and Six Sigma. Actually there are differences but does anyone know how to define TQM exactly. Can I use Deming for this comparison? Does it make sence to point […]

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History of the Six Sigma Black Belt Naming Convention

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Motorola, the company that holds the Six Sigma trademark, says the data-driven defect-reduction process has saved the company more than $16 billion over the past 15 years. Six Sigma has generated similarly stunning results at companies here and abroad in the manufacturing, transactional, and service sectors. All businesses – regardless of sector, size, or project – link […]

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Remembering Bill Smith, Father of Six Sigma

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Bill Smith spent years convincing higher-ups that he really had invented a better mousetrap. Then he spent the rest of his life spreading the word to business professionals, government leaders and educators. Smith’s mousetrap? It was Six Sigma, the TQM spin off that has generated billions of dollars for Motorola, the company where Smith introduced […]

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The History of Six Sigma

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The roots of Six Sigma as a measurement standard can be traced back to Carl Friedrich Gauss (1777-1855) who introduced the concept of the normal curve. Six Sigma as a measurement standard in product variation can be traced back to the 1920’s when Walter Shewhart showed that three sigma from the mean is the point […]

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Six Sigma Roles and Responsibilities

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Six Sigma has a martial arts convention for naming many of its professional roles. The chart below describes how these roles are typically defined. Leaders and Champions usually receive high-level training on the technical aspects of Six Sigma and specific training on how to lead an initiative. At the “Belt” level, each candidate is assigned […]

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What Is DFSS?

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Design for Six Sigma (DFSS), or the Six Sigma DMADV process (Define, Measure, Analyze, Design, Verify), is an improvement system used to develop new processes or products at Six Sigma quality levels. It also can be employed if a current process requires more than just incremental improvement. It is executed by Six Sigma Green Belts […]

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Six Sigma DMAIC Roadmap

Six Sigma DMAIC Roadmap

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The Six Sigma DMAIC (Define, Measure, Analyze, Improve, Control) methodology can be thought of as a roadmap for problem solving and product/process improvement. Most companies begin implementing Six Sigma using the DMAIC methodology, and later add the DFSS (Design for Six Sigma, also known as DMADV or IDDOV) methodologies when the organizational culture and experience […]

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What is Six Sigma Certification?

What Is Six Sigma Certification?

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Many people have written to iSixSigma asking various questions about Six Sigma certification, like: How can I get Six Sigma certified? Where can I get Six Sigma certified? Is Six Sigma certification transferable if I leave a company for another? This article will help answer these questions regarding the ubiquitous and confusing “Six Sigma certification” topic.

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Malcolm Baldrige National Quality Award Recipients’ Stock Outperforms S&P 500

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For the seventh straight year in a row, the Commerce Department’s National Institute of Standards and Technology (NIST) has conducted a stock performance study of the Malcolm Baldrige National Quality Award winners. And for the seventh straight year in a row, the investment study has concluded that the Baldrige group stock has outperformed the S&P […]

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An Introduction to ISO 9000, 9001, 9002, ISO 9000:2000

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As geographic barriers between countries deteriorate with the continued evolution of the Internet, ISO 9000 may be one of the largest differentiators between you and your competitors. Already, ISO 9000 plays a key role in winning new customers, maintaining satisfied current customers, accessing foreign countries and dealing with the government. What is ISO 9000, 9001, […]

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Is There Bias In Your Random Sample?

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By definition, a sample of size n is random if the probability of selecting the sample is the same as the probability of selecting every other sample of size n. If the sample is not random, a bias in introduced which causes a statistical sampling or testing error by systematically favoring some outcomes over others. […]

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Are You New To Six Sigma?

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Find answers, links and resources to all your basic Six Sigma questions.

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Rounding and Round-off Rules

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When performing statistical data analyses, quality professionals are always challenged to maintain data integrity. When should you round up the answer; when should you round down? How many significant figures are appropriate for the data set that has been taken? Below are a set of simple rules that should help you traverse the perils of […]

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