CRE Preparation Blog

A WordPress blog focused on aiding those preparing for the ASQ Certified Reliability Engineer exam. The following excepts are from the most recent blog entries. To see the full list of posts, please visit https://accendoreliability.com/creprep/, or click on one of the excepts below.

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  • Time Compression Accelerated Life Testing
    Time Compression ALT – The Easy One The easiest ALT is one that you operate an item more often then operated by the customer. Removing spans of time the item is not being bent, moved, heated, etc allo …
  • 4 Different Types of Reliability Testing
    Getting the Right Information from Your Reliability Testing You cannot test in reliability any more than you can test in quality. Often reliability testing is done though, and knowing the range of tes …
  • 4 Steps to Accomplish HALT
    HALT in 4 Not Always Easy Steps Highly Accelerated Life Testing, HALT, is a method to discover the weaknesses in a design. Using a step stress approach of single and combined stresses, you can quickly …
  • Taguchi Design of Experiments Approach
    Taguchi Design of Experiments Approach Dr. Taguchi was an engineer, not a statistician. He considered the ability of design of experiments (DOE) to identify and reduce sources of variability, yet need …
  • Taguchi’s 3 Fundamental Concepts
    Taguchi’s 3 Fundamental Concepts Taguchi may be best known for the variation of design of experiments that bear his name. Yet the impact of his work is felt across the product life cycle and all of th …
  • You Are a Reliability Leader, Now Make a Difference
    Reliability Engineering Leadership Role Leadership is not a position or title within an organization. It is an attitude. You’ve seen the internet meme’s about the difference between leadership and man …
  • Introduction to the Quality Triangle
    The Quality Triangle of Priorities and Balance Have you ever worked on a project with no deadlines, unlimited resources, and boundless scope? Probably not. You may have worked under the guidelines of …
  • Using Reliability Goals to Set Requirements
    Using Reliability Goals to Set Requirements Customers of your product would like the particular one they have to work. To work over time. If a product meets the customer’s expectation by working as lo …
  • Uncertainty and Risk Management
    Uncertainty and Risk Management We are rather good at being surprised when setting expectations for the future. This is the essence of risk. The difference between what we expect to occur or would lik …
  • The Connection of Reliability and Customer Expectations
    Customers Experience Product Reliability in Real Time In a customer’s mind, the product works or it doesn’t. If it doesn’t work as expected it has failed. This may or may not be a reliability problem. …
  • Performing the Right Correcting Action
    Performing the Right Corrective Action When something doesn’t work as expected, it is a failure. A common response to a failure by an organization is to restore the system or remedy the situation. Eac …
  • Overview of System Reliability Modeling
    Building and Using a Reliability Model From the simplest to the most complex system, building and using a reliability model permits the entire team to make better decisions. Understanding and monitori …
  • The Many Ways We Use Variance
    The term variance is a statistical concept related to the spread or dispersion of a set of data. Second to the mean, it a common value we may calculate. We find standard deviation easier to understand …
  • Introduction to Risk Terminology
    Introduction to Risk Terminology The world of risk management has a unique set of risk terminology. Your ability to incorporate reliability concerns into the discussions concerning risk hinges on unde …
  • Definition of Risk Related to Reliability
    Definition of Risk Related to Reliability Creating a reliable product that meets customer expectations is risky. What is risk and how does one go about managing risk? The recent set of ISO standard up …
  • Introduction to Design for Reliability
    Introduction to Design for Reliability Chapter 7 Design for Reliability of the book Practical Reliability Engineering starts with: The reliability of a product is strongly influenced by decisions made …
  • Siegel-Tukey Test for Differences in Scale
    Siegel-Tukey Test for Differences in Scale There are a few different reasons we explore differences in scale. Keep in mind that the scale of a dataset is basically the spread of the data. For most dat …
  • Hartley’s Test for Variance Homogeneity
    Hartley’s Test for Variance Homogeneity The Hartley test is an extension of the F distribution based hypothesis test checking if two samples have different variances. The F test works with two samples …
  • The Sum of Squares Concept
    Why Do We Use the Sum the Squares so Often? The data analysis course professor tended to focus on the practical application of statistics. Avoiding statistical theory was fine with me. Learning statis …
  • Bartlett’s Test for Homogeneity of Variances
    Bartlett’s Test for Homogeneity of Variances A common assumption when comparing three or more normal population means is they have similar (the same) population variances. ANOVA and some DOE analysis …

Course offerings

If you or your team would like a custom CRE prep course, just let me know and we’ll make arrangements to make it happen. I also teach a live 32 hour CRE Preparation course through the

ASQ Silicon Valley Section when we have at least four students. The course runs for the 8 weeks prior to semi annual exam. Learn more about the CRE at the ASQ site.