No MTBF Blog

A site devoted to the eradication of MTBF. The following excepts are recent posts of the

NoMTBF blog. Click through or visit nomtbf.com to learn more about the perils and what you can do instead of using MTBF.

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  • Futility of Using MTBF to Design an ALT
    Futility of Using MTBF to Design an ALT Let’s say we want to characterize the reliability performance of a vendor’s device. We’re considering including the device within our system, if and only if, it …
  • Two Ways to Think and Talk about Reliability
    Two Ways to Think and Talk about Reliability Neither includes using MTBF, btw. And, I’m not thinking about the common language definition either. Plus, I may have this all wrong. Here is the way I thi …
  • The Damage Done by Drenick’s Theorem
    The Damage Done by Drenick’s Theorem Have you ever wondered by we use the assumption of a constant failure rate? Or considered why we assume our system is ‘in the flat part of the curve [bathtub curve …
  • 3 MTBF Stories
    3 MTBF Stories Everyone loves a great story. Storytelling has been a long tradition to pass along knowledge and wisdom. There are good stories, tales of inspiration. There are sad stories, tales of ca …
  • Different Data Same Decision
    Different Data Same Decision Let say you have some time to failure data on your equipment. A common action is to calculate the MTBF. All well and good until you expect to make a meaningful decision ba …
  • 5 Reasons Rate of Change is Important
    5 Reasons Rate of Change is Important A simplifying assumption associated with using MTTF or MTBF implies a constant hazard rate. Some assume we’re in the useful life section of the bathtub curve. Oth …
  • How About Weibull Instead of MTBF?
    What About Weibull, Can I Use it Instead of MTBF? This was a follow up question in a recent discussion with Alaa concerning using a metric other than MTBF. The term ‘Weibull’ in some ways has become a …
  • Are We Teaching Reliability All Wrong?
    Let’s Demand Better Reliability Engineering Content Teaching reliability occurs through textbooks, technical papers, peers, mentors, and courses. The many sources available tend to use MTBF as a prima …
  • Life Data Analysis with only 2 Failures
    Life Data Analysis with only 2 Failures Here’s a common problem. You have been tasked to peer into the future to predict when the next failure will occur. Predictions are tough. One way to approach th …
  • Discussions and MTBF Questions
    The Importance of the Discussions around MTBF Questions The best way to help others understand and stop using MTBF is to engage them in a discussion. I get questions concerning MTBF or reliability a f …
  • 3 Types of MTBF Stories
    The MTBF Stories You Tell Can Cause Change Stories communicate well. We have been telling stories long before the invention of writing, or the internet. The MTBF stories we tell communicate our ideas, …
  • 3 Recent Questions and Comments Concerning MTBF
    Trying to Respond to All Questions and Comments Concerning MTBF Over the past couple of days, like most days, have received questions and comments concerning MTBF. I do try to respond to all questions …
  • Exposing a Reliability Conflict of Interest
    Is Your Organization Compromising Reliability Performance Due to a Reliability Conflict of Interest? Kirk Gray wrote the article titled Exposing a Reliability Conflict of Interest on Accendo Reliabili …
  • How We Think About Reliability
    How We Think About Reliability Is Important Getting on an airplane we think about the very low probability of failure during the flight duration. This is how we think about reliability. When buying a …
  • MTBF Use May Reduce Product Reliability
    Is MTBF Preventing Your Product From Being Reliable? MTBF is not reliability. Attaining a specific MTBF does not mean your product is reliable. MTBF use may be the culprit. Therefore, working to achie …
If you’d like to learn more about MTBF and how to improve your reliability metrics, let’s talk.