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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  • Calculating the Probability of a Sample Containing Bad Parts
    Calculating the Probability of a Sample Containing Bad Parts Received a question from a reader this morning that will make a nice tutorial. A box contains 27 black and 3 red balls.  A random sample of …
  • An Introduction to the Cause and Effect Diagram
    An Introduction to the Cause and Effect Diagram Also called the Ishikawa or fishbone diagram, the cause and effect diagram is a graphical tool that enables a team to identify, categorize, and examine …
  • Mind Mapping for Non-Linear Thinking
    Mind Mapping for Non-Linear Thinking Sometimes a process doesn’t happen one step at a time. Sometimes, a problem we’re trying to solve has many moving and interacting elements. Mind Mapping is a techn …
  • Check Sheet: Capture Data Quickly
    Check Sheet: Capture Data Quickly There are two common uses for a check sheet. First, to summarize historical data, or second, to collect observations. A byproduct of creating a check sheet is team ag …
  • Measurement Systems
    Introduction Most of us rely on accurate measurements. If these measurements are unreliable, then our decision could be based on false information. How can we have confidence in our measurements? The …
  • Basics of Affinity Diagrams
    Basics of Affinity Diagrams When you have a scattering of ideas or suggestions, you can use affinity diagrams to organize and group them. Affinity diagraming is a simple way for an individual or (bett …
  • Basics of Brainstorming
    Basics of Brainstorming Did you know that best idea to solve a problem is often not the first one? We all have plenty of bad ideas, hunches, guesses, and flawed ideas. That is ok. We also have great i …
  • Extended Bogy Testing
    Extended Bogy Testing Introduction Extended bogy testing builds on test to bogy (TTB), discussed in a prior article. TTB focused on calculating the number (N) of parts tested to one life bogy, with 0 …
  • The Non-parametric Friedman Test
    The Non-parametric Friedman Test The Friedman test is a non-parametric test used to test for differences between groups when the dependent variable is at least ordinal (could be continuous). The Fried …
  • Continuous Improvement of the Risk Management Framework
    Continuous Improvement of the Risk Management Framework Systems and processes exist in our dynamic world. Each organization and situation is different. Just as there is not one risk management process …
  • How to Estimate the Number of Failures Next Month
    How to Estimate the Number of Failures Next Month Let’s say you have shipped 1,000 products to your customer on January 1st. All are immediately placed into service. And each month since you have rece …
  • Determine Success Testing Sample Size
    Determine Success Testing Sample Size “How many samples do we need?” is a very common question. It is one you will receive when planning nearly any kind of reliability testing. It is a great question. …
  • The Basics of Planned and Deferred Maintenance
    The Basics of Planned and Deferred Maintenance We can plan to do more than we are capable of accomplishing. The remaining items, if they warranty accomplishing become deferred. They roll over to the n …
  • Data Outliers and Questions
    Data Outliers and Questions When looking at a pile of data, sometimes there is a data point that is not like the others. It attracts attention as it is different than the rest of the data. When I spot …
  • The Detail Necessary in a Risk Management Plan
    The Detail Necessary in a Risk Management Plan A risk management plan has to meet your organizations needs as the organization identifies, manages, and mitigates potential and actual risks. The ISO 31 …
  • McNemar Test
    The NcNemar Statistical Test The McNemar test is a nonparametric statistical test to compare dichotomous (unique) results of paired data. If you are comparing survey results (favorable/unfavorable) fo …
  • The 3 Parameter Triangle Distribution 4 Formulas
    The 3 Parameter Triangle Distribution 4 Formulas This is part of a short series on the common distributions. The Triangle distribution is univariate continuous distribution. This short article focuses …
  • The 2 Parameter Uniform Distribution 7 Formulas
    The 2 Parameter Uniform Distribution 7 Formulas This is part of a short series on the common distributions. The Uniform distribution is a univariate continuous distribution. This short article focuses …
  • The 1 Parameter Poisson Distribution 4 Formulas
    The 1 Parameter Poisson Distribution 4 Formulas This is part of a short series on the common life data distributions. The Poisson distribution is a discrete distribution. This short article focuses on …
  • The 2 Parameter Pareto Continuous Distribution 7 Formulas
    The 2 Parameter Pareto Continuous Distribution 7 Formulas This is part of a short series on the common life data distributions. The Pareto distribution is a univariate continuous distribution useful w …

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.