In this issue:

Issue 96, February 2009

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

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Hot Topics

Comparing Two Products Using a Single Metric
A common task for a reliability engineer is to determine if one product is better than another. Often, comparison of a single metric, such as the time by which X% of the population is expected to fail (also known as the BX life), is used to answer the question of which product is superior. This article will illustrate two graphical methods to compare the B10 lives of two different designs using ReliaSoft's Weibull++ software.

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Reliability Basics
Preventive Maintenance and the Cost Per Unit Time Equation
Components that wear out are candidates for preventive maintenance. When the cost to replace a component before it fails is less than the cost to replace the component after it fails, it makes sense to maintain the component preventively. The optimum preventive maintenance time can be found using the Weibull++, BlockSim and RCM++ software packages from ReliaSoft. These methods are based on the cost per unit time to maintain the component, and they are presented in this article.

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Tool Tips
  • What tools does ReliaSoft offer to help engineers design reliability tests?
  • What discounts are available for ReliaSoft's training seminars?

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Latest Software Updates
New service releases are now available for Weibull++ (SR 7.5.7), ALTA (SR 7.5.7), DOE++ (SR 1.0.4), Xfmea Standard (SR 4.0.7), Xfmea Enterprise (SR 4.0.7) and RCM++ (SR 4.0.7). To determine the compile revision of the application on your computer, select About from the Help menu. More Software Downloads...


Application Date Created Version
Weibull++ 7 1/23/09 7.5.7
ALTA 7 1/23/09 7.5.7
DOE++ 1/23/09 1.0.4
Xfmea 4 Standard 1/20/09 4.0.7
Xfmea 4 Enterprise 1/20/09 4.0.7
RCM++ 4 1/20/09 4.0.7
Hot News
* 2009 ARS Europe - The International Applied Reliability Symposium is coming to the Princess Sofia Hotel in Barcelona, Spain on March 25 - 27, 2009. There is still time to register, but don't wait too long! The program allows you to choose from 22 results-oriented presentations and 2 in-depth tutorials. For more information about ARS Europe, please visit
* Advance Registration for 2009 ARS India - This year's event will be hosted at the Le Meridien Pune hotel in Pune, India on April 15 - 17, 2009. The Advance Registration discount is available until March 25, 2009, so don't delay! On-line registration is available now. You will have 18 results-oriented presentations and 3 in-depth tutorials to choose from. For more information about ARS India, please visit
* RAMS 2009 - Many thanks to those who visited our booth. We received numerous inquires regarding XFRACAS and Xfmea and also presented on numerous topics, including "Improving the 1-Parameter Weibull: A Bayesian Approach," "Warranty Prediction for Products with Random Stresses and Usages" and "Introduction to R&M Management (Reliability from Design Inception to Product Retirement)." These papers are now available online at
* ReliaSoft Standing By to Help Even during times of economic stress, successful organizations recognize that effective reliability strategies must remain an essential element to long-term company viability. In fact, experience indicates that when a company attempts to reduce development costs by cutting reliability and quality tasks, they may end up paying much more in the long run due to factors such as increased warranty costs, loss of future business and exposure to critical safety or regulatory issues. If you find that your organization could use some extra, independent support to help you navigate through these difficult times while continuing to maintain high standards of quality and reliability, ReliaSoft is standing by to help. We offer a wide range of training and consulting services that can help you select, plan and implement the reliability tasks that will be most effective for supporting lean engineering and low overall life cycle costs. Please contact us to find out how. Visit for complete contact information.
Upcoming Public Training Event Calendar
February 2009
February 18 - 20, 2009: RS 522 Advanced System Reliability / Maintainability Analysis in Turin, Italy
February 23 - 27, 2009: MSMT Foundations in Penang, Malaysia
February 23 - 27, 2009: MSMT Foundations in Tucson, Arizona
February 26 - 27, 2009: RS 401(C) Reliability and Life Data Analysis (Condensed) in Rayong, Thailand
March 2009
March 16 - 20, 2009: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Jakarta, Indonesia
March 16 - 18, 2009: RS 522 Advanced System Reliability / Maintainability Analysis in Tucson, Arizona
March 19 - 20, 2009: RS 470 Failure Modes, Effects and Criticality Analysis in Tucson, Arizona
March 25 - 27, 2009: International Applied Reliability Symposium in Barcelona, Spain
April 2009
April 15 - 17, 2009: International Applied Reliability Symposium in Pune, India
April 20 - 22, 2009: RS 560 Fundamentals of Design for Reliability in Singapore
April 20 - 24, 2009: MSMT Foundations in United Kingdom
April 20 - 24, 2009: MSMT Foundations in Tucson, Arizona
April 28 - 29, 2009: RS 480 RCM Principles and Applications in Singapore
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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