Posts Tagged ‘customer requirements’

The Lean, Six Sigma, and Quality Triad

Tuesday, May 31st, 2011

In response to a message from a colleague asking about the relationship between Lean, Six Sigma and Quality, I wrote the following:

Both Lean and Six Sigma (and Lean Six Sigma, the combination of the two) are ways of improving operational excellence. Lean does this by improving flow through value streams, primarily focusing on the elimination of various forms of muda (waste.) Six Sigma does this by identifying what customers and other stakeholders want and delivering it with minimal waste, variation and errors.

The Lean and Six Sigma DMAIC disciplines focus on the processes for creating and delivering products and services that meet or exceed customer expectations. The Design for Six Sigma discipline focuses on the design of products or services that meet or exceed customer expectations. Quality is a discipline which focuses on identifying customer requirements and expectations, translating them into internal requirements, and assuring that the requirements are consistently met. Of course, these Quality activities provide input into both Lean and Six Sigma. It is the “Y” being solved for when waste is identified (Lean) or when searching for the root causes of waste, variation and errors (Six Sigma.)

Thus, Lean, Quality, and Six Sigma are all different aspects of excellence.

I welcome your comments on how you consider the three areas to be related. Or do you consider them to be unrelated ideas?

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What Do We Mean by Quality?

Thursday, May 14th, 2009

News from Cambridge UK.

Quality, it seems, is harder to define than one might think. The article’s author, Tom Gaskell. takes yet another stab at defining this slippery term. He begins by presenting the widely accepted, intuitive definition of quality as goodness, luxury, or high priced exclusivity. While this is not incorrect, it is of limited use to those interested in improving the quality of their non-luxury product or service. Gaskell then alludes to the definitions of W. Edwards Deming, Joseph M. Juran, Phillip Crosby and ISO 9000, all offering definitions based on customer requirements and demands.

This is, of course, the basis of quality as used in Six Sigma and Lean. As Gaskell correctly points out

“Quality is about meeting requirements, exactly and in full. It isn’t about providing more and more features, or complexity, or performance, or ‘goodness’ that increases cost, takes longer to provide or makes it more difficult to use, and may not be required or expected by the customer.”

Exactly.

Six Sigma broadens this definition by including quality “requirements” that the customer doesn’t even know about. By studying customers Design for Six Sigma (DfSS) identifies latent customer requirements and designs new products and services that deliver them. These unexpected and delightful features soon become requirements that customers demand in the future, thereby becoming quality requirements as defined by the quality gurus. If, on the other hand, customers see these as mere baubles that they don’t want to pay for, the new features become waste and are eliminated. Thus, in the end, it is the customer who decides on the definition of quality.

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IndustryWeek : China Must Do More Says EU as Unsafe Products Hit Record High

Tuesday, April 21st, 2009

IndustryWeek : China Must Do More Says EU as Unsafe Products Hit Record High.

Safety is an aspect of quality. Quality can be defined as conformance to customer requirements, and safety is certainly a customer requirement. I think that there are several issues here:

  1. Do the data show that products made in China are less safe than products made elsewhere? If so, who is responsible?
  2. Are product safety issues increasing?
  3. Finally, what can be done to improve product safety?

Are Chinese products less safe?According to RAPEX, the European Commission’s Rapid Alert System for dangerous consumer products, “It is clear … that Chinese products, and in particular, toys are overrepresented in the RAPEX statistics.” Chinese made toys, for example, account for about half of the toys sold in the EU, but they represent 80% of the RAPEX notifications. Regarding responsibility, the EU Consumer Commission assigns first responsibility to the manufacturers or their commercial representatives in the EU. I agree. Both the manufacturer in China and the organization acquiring and distributing these goods share responsibility for assuring the safety of their products.

Are safety issues increasing?While product safety issues are making more headlines, published data make it difficult to determine whether or not actual incidents are increasing. To determine this it would be best to have data in a form that could be displayed on a time-ordered chart, such as a control chart. However, the best I could find were data such as the EU’s statement “While the overall trade flow between the EU and China has greatly increased over the 2003-2006 period, the overall number of RAPEX notifications of Chinese origin has remained stable, even going down to 46% in the first six months of 2007.” Based on this it would seem that safety issues are either stable or, perhaps, declining.

What can be done to improve product safety? I’ve made numerous trips to China and visited many Chinese factories. I believe that China, and government agencies in Europe and US, is too focused on regulation and inspection. Advanced companies in the developed world abandoned this approach decades ago in favor of process control and continuous improvement. To be sure, inspection is still used. But it is merely used to confirm that the process controls continue to be effective. It’s a case of focusing on root causes rather than focusing on outcomes. Safety failures are not acts of God. They are a predictable and preventable outcome with one or more causes. Modern quality and safety is assured by understanding the processes in detail and acting to control process suppliers, inputs and actions to assure a quality result. Lean, Six Sigma and other methodologies are used to create excellent processes. Lean Six Sigma provides built-in process control using mistake-proofing, just-in-time production and delivery, visible factory displays, and a culture dedicated to product quality and safety.

When I go to my local fast food restaurant with my Grandson, I want to know that the toys he receives are safe. I’d feel a lot more confident if I knew that the manufacturer had process control and improvement in place rather than an army of inspectors and government regulators.

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