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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  • 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 …
  • Survey Results for 2016 CRE Preparation Recommended References
    The Survey Results Are In Here the 2016 survey results as reported by the TypeForm survey tool.   2016 Survey Results and Discussion The Typeform powered survey open in December 2016 enjoyed 51 unique …
  • Confidence Interval Interpretations and Misunderstandings
    Confidence Interval Interpretations and Misunderstandings Confidence intervals (CIs)provide a means to judge point estimates based on a sample from the population. If that statement excites you, you m …
  • Tolerance Specifications Impact on Reliability
    Tolerance Specifications Impact on Reliability Mechanical drawings and electrical schematics communicate the design. They provide information sufficient to create a product or build a system. They pro …
  • Inputs to Consider When Setting Tolerances
    Inputs to Consider When Setting Tolerances Technical drawings and electrical specifications often include tolerances. The range of values allowed for a particular aspect of the part. Reliability engin …
  • The Basics of Vibration and Shock
    The Basics of Vibration and Shock Did you shake a wrapped gift as a child? Sometimes the rattling sound may indicate the hidden contents. A sweater from Grandma would make a muffled sound, while a new …
  • Introduction to Thermal Cycling Life Testing
    Introduction to Thermal Cycling Life Testing Materials expand or contract with temperature change. Water expands as it freezes, whereas steel contracts as it cools. This motion can limit the life of y …
  • Introduction to High Temperature Life Testing
    Introduction to High Temperature Life Testing A common reliability test involves ‘baking’ a few units. Various standards list temperature, duration, and sample size requirements. When the units surviv …
  • Overview of Benchmarking
    Overview of Benchmarking Benchmarking is the systematic process of observation and analysis. The evaluation of a project, method or process best practices as performed by recognized industry leader ma …
  • Getting Started in Reliability Engineering
    Reliability Engineers Preparing for the CRE Initially, the CRE Prep blog aimed at providing refresher material for those preparing for the ASQ CRE exam. In discussions with readers, it has become clea …
  • Exam Taking Insights and a Request
    New Computer Based Exam Taking Insights Recently one of the CRE Preparation course students sat for the ASQ CRE exam at one of the Prometrics testing centers. She passed – which is great, and she knew …
  • Customer Reliability Expectations Change
    Customer Reliability Expectations Change Image that. Customers say one thing and expect something else. A customer may provide a detailed and complete reliability specification, then, 6 months into us …
  • When is DOE Useful?
    When is DOE Useful? On page 6 of Statistics for Experimenters, Box, Hunter and Hunter suggest a scientist could conduct an investigation without statistics. Whereas, a statistician could not do so wit …
  • Plotting Repairable System Failure Data
    Plotting Repairable System Failure Data A good plot reveals the data’s story. Repairable system data is what is called by statisticians a renewal process. The repair activity may restore the system to …

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.