In this issue:

Issue 87, May 2008

*Hot Topics
*Reliability Basics
*Tool Tips
*Latest Software Updates
*Hot News
*Contribute to HotWire

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Hot Topics

How to Define a Complicated Stress Profile
In accelerated life tests, constant and step stresses are commonly used. It is not difficult to get the profile functions for them because of their simplicity. However, in some applications, the stress profile is very complicated. Obtaining the function for such a profile is not a simple task. In this article, we will discuss how to use Weibull++ and ALTA to define a complicated profile function. Parabolic functions are used as an example. However, the method described is a general one and can be extended to any stress profile function.

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Reliability Basics
Residual Plots for Lifetime Distributions
Residual plots are widely used in linear regression analyses. By examining the pattern of residual plots, one can identify if there are additional variables that should be included in the regression model. Residual plots also can help analysts find outliers in the data set. More often, residual plots are used to diagnose if a model or a distribution can fit the data well. In this article, we will use DOE++ to illustrate the usefulness of residual plots in life data analysis. Only DOE++ offers Reliability DOE, which is specifically intended to handle life data obtained from designed experiments, either with or without censoring, and allows you to use the Weibull, lognormal or exponential distribution to analyze data.

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Tool Tips
  • How can I exclude effects from my DOE++ analysis?
  • How can I display probability scales on the probability plots in Weibull++ 7

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Latest Software Updates
New service releases are now available for Xfmea Standard (SR 4.0.5), Xfmea Enterprise (SR 4.0.5) and RCM++ (SR 4.0.5). To determine the compile revision of the application on your computer, select About from the Help menu. More Software Downloads...


Application Date Created Version
Xfmea 4 Standard 4/17/08 4.0.5
Xfmea 4 Enterprise 4/17/08 4.0.5
RCM++ 4 4/17/08 4.0.5
Hot News

ARS North America 2008 Do you want to learn how to make reliability engineering a cost-competitive advantage for world class quality? If you answered "yes," then you will benefit from Mr. Allan Rae's keynote address at the upcoming International Applied Reliability Symposium at the Grand Sierra Resort in Reno, Nevada from June 17-20, 2008. This year's variety of topics will focus on sharing applications, success stories and lessons learned in reliability and maintainability engineering. To register online, please visit Remember to reserve your hotel room by May 18, 2008 in order to qualify for the negotiated Symposium rate for the Grand Sierra Resort.

* CRE Exam Prior to ARS - We are pleased to announce that the American Society for Quality (ASQ) will administer the Certified Reliability Engineer (CRE) Exam on Monday, June 16, 2008 from 2:00 PM to 6:00 PM at the Grand Sierra Resort in Reno, Nevada. The application form is available from the ASQ website at Hurry! The application deadline is May 16th!
* MIL-STD-217 Revision Questionnaire - The Defense Standardization Program Office (DSPO) has tasked the Crane Division of the Naval Surface Warfare Center (NSWC) with executing a revision of MIL-HDBK-217, which is used for the Reliability Prediction of Electronic Equipment. In order to achieve the best possible results, Crane has established a Web page to solicit input from the reliability community. If you are interested in obtaining additional information, submitting comments or participating in the revision of MIL-HDBK-217, please refer to the questionnaire posted at
* RCM Training Seminar - RS 480 Introduction to RCM Principles and Applications is a two-day training course that will help you understand why Reliability Centered Maintenance (RCM) is so critical for optimizing your maintenance strategy and the benefits that can be achieved in terms of safety, cost and performance. To register online for the next available seminar on June 5-6, 2008, please visit our Web site at
Upcoming Public Training Event Calendar
May 2008
May 12 - 14, 2008: RS 522 Advanced System Analysis in Manchester, UK
May 14 - 16, 2008: RS 521 Advanced QALT in Tucson, Arizona
May 14 - 16, 2008: RS 511 Adv. Reliability Growth Analysis in Tucson, Arizona
May 15 - 16, 2008: RS 470 FMEA/FMECA in Manchester, UK
June 2008
June 30 - July 4, 2008: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Singapore
June 5 - 6, 2008: RS 480 Reliability Centered Maintenance in Tucson, Arizona
June 9 - 13, 2008: MSMT Foundations in Turin, Italy
June 11 - 13, 2008: RS 560 Introduction to Design for Reliability in Bangalore, India
June 17 - 20, 2008: International Applied Reliability Symposium in Reno, Nevada
July 2008
July 10 - 11, 2008: RS 401(C) Life Data Analysis (Condensed) in Pune, India
July 14 - 18, 2008: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Tucson, Arizona
July 28 - August 1, 2008: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Melbourne, Australia
Contribute to HotWire
Contributions Welcomed
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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