In this issue: Issue 128, October 2011
*Hot Topics
*Reliability Basics
*Tool Tips
*Hot News
*Contribute to HotWire

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Hot Topics
Analyzing Failure Modes Using RBDs in Weibull++
Weibull++ provides the ability to use a reliability block diagram (RBD) to model series, parallel and k-out-of-n configurations. In this article, we will give an example of how to use an RBD to conduct failure modes analysis.

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Reliability Basics
Extreme Value Distributions
Three types of asymptotic distributions have been developed for maximum and minimum values based on different initial distributions. These distributions are based on the extreme types theorem, and they are widely used in risk management, finance, economics, material science and other industries. In this article, we will introduce all three distributions. Two of them are of particular interest in reliability engineering: the type I asymptotic distribution for both maximum and minimum values (for minimum values, this is referred to as the Gumbel/Smallest Extreme Value (SEV) distribution in Weibull++), and the type III asymptotic distribution for minimum values (i.e., the well-known Weibull distribution).

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Tool Tips
  • How should I use the Grouped Data Settings in Weibull++?
  • How can I customize the way Xfmea/RCM++ prioritizes and highlights failure causes listed in my FMEA?

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Hot News

Call for Presenters - A captive audience awaits for those who are willing to use their creativity, expertise and real-world experience to garner a coveted presentation slot at the 2012 International Applied Reliability Symposium, North America. We know there are many professionals out there who have spent years developing and polishing their reliability engineering skills, and we know from past events that there are even more who could benefit from hearing the stories that could be shared from such experiences. The Symposium will be held from June 13 - 15, 2012 in New Orleans, Louisiana and the presentation proposal deadline is December 7, 2011. Complete details, including the required proposal form, are available for your review at If your proposal is selected, you will gain not only the prestige of being an ARS presenter, but also complimentary registration to the event, a shirt with the ARS logo and a shot at winning one of the Excellent Presentation Awards!


Public FRACAS Seminar - One time a year, ReliaSoft offers the RS 475 FRACAS Principles and Applications training seminar to the general public. Don't miss your chance this year! This class, scheduled for November 16 - 17, 2011 in Tucson, Arizona, is a two-day course that provides an overview of the fundamentals of Failure Reporting, Analysis and Corrective Action Systems (FRACAS). Emphasis is placed on configuring and using ReliaSoft’s XFRACAS software for incident reporting, failure analysis, problem resolution and other related analyses. For a detailed course outline, please visit To register on-line, simply visit or contact our sales team in the USA at +1-520–886-0410.

Upcoming Public Training Event Calendar
October 2011
October 11 - 13, 2011: RS 560 Fundamentals of Design for Reliability in Berlin, Germany
October 12 - 14, 2011: International Applied Reliability Symposium in Bangalore, India
October 19 - 21, 2011: International Applied Reliability Symposium in Singapore
October 24 - 28, 2011: MSMT Foundations in Tucson, Arizona
November 2011
November 14 - 18, 2011: MSMT Foundations in Melbourne, Australia
November 14 - 18, 2011: MSMT Foundations in Bordeaux, France
November 16 - 17, 2011: RS 490 Standards Based Reliability Prediction in Tucson, Arizona
November 16 - 17, 2011: RS 475 FRACAS Principles and Applications in Tucson, Arizona
November 28 - December 2, 2011: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Chennai, India
December 2011
December 6 - 8, 2011: RS 511 Application of Reliability Growth Models in Developmental Testing and Fielded Systems in Tucson, Arizona
December 6 - 8, 2011: RS 521 Advanced Accelerated Life Testing Analysis in Tucson, Arizona
December 19 - 21, 2011: RS 401(C) and RS 402 Life Data Analysis (Condensed) and Intro to Accelerated Testing in Bangalore, India
Contribute to HotWire
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As always, your feedback and contributions are appreciated. ReliaSoft is able to provide the most user-friendly reliability software packages and support because we listen to our customers. This applies to our newsletters and publications as well. We welcome any suggestions or contributions you may have for Reliability HotWire. If you have a topic or article that you think would be useful to the readers of Reliability HotWire, feel free to contact us.
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