In this issue: Issue 108, February 2010
*Hot Topics
*Reliability Basics
*Tool Tips
*Latest Software Updates
*Hot News
*Contribute to HotWire

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Hot Topics
Using the Chart Wizard to Create a Custom Plot
A wide variety of plots are built into the Weibull++ software, as well as the ability to combine separate data sets on a single plot using the MultiPlot. However, sometimes a desired plot is not available. For example, suppose that you want to plot component reliabilities and the system reliability obtained from a reliability block diagram on a single plot. In Weibull++, you can obtain the plot of the component reliability versus time in the Standard Folio, and the plot of system reliability versus time using the Diagram. You can then create a custom plot that combines these plots. This article will show the steps to create such a custom plot in Weibull++.

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Reliability Basics
Failure Rate of a Series System Using Weibull++
In many reliability prediction standards, systems are assumed to have components described by exponential distributions (i.e. constant failure rates) arranged in series. The goal of these standards is to determine the system failure rate, which is computed by summation of the component failure rates. However, many reliability engineers do not realize that for components arranged reliability-wise in series, the system failure rate at a given time is always equal to the sum of the component failure rates at that time, regardless of the distributions used to describe the components. This article will provide the mathematical justification of the preceding statement and show an example of two methods of plotting the system failure rate function using Weibull++.

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Tool Tips
  • Is there an easier way to enter my license when activating one of ReliaSoft’s software products?
  • How can ReliaSoft help my organization configure the XFRACAS system to meet our particular needs?

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Latest Software Updates
A new service release is now available for Weibull++ (SR 7.5.9), ALTA (SR 7.5.9), DOE++ (SR 1.0.6), Xfmea Standard (SR 4.0.9), Xfmea Enterprise (SR 4.0.9) and RCM++ (SR 4.0.9). 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 2/3/10 7.5.9
ALTA 7 2/3/10 7.5.9
DOE++ 2/3/10 1.0.6
Xfmea 4 Standard 1/22/10 4.0.9
Xfmea 4 Enterprise 1/22/10 4.0.9
RCM++ 4 1/22/10 4.0.9
Hot News
* RAMS 2010 - Thanks to all of you who visited our booth this year! As in previous years, interest in Weibull++ and Xfmea has remained strong; we also noticed an increased interest in BlockSim. We were especially honored to receive the Stan Oftshun Award for Best Paper by an SRE Member for our presentation, "Reliability Estimation for One-Shot Systems with Zero Component Test Failures." We also presented on other topics including "Piecewise NHPP Models with Maximum Likelihood Estimation for Repairable Systems," "Best Practices for Effective Reliability Program Plans" and "Temperature Acceleration Models in Reliability Predictions: Justification & Improvements." These papers are now available for download from
*  Expanded FMEA Training - You asked for more help with practical FMEA facilitation and we listened. Starting in March, we will be offering the new Effective FMEA Series. This is a 5-day series that consists of two courses. RS 470 provides the foundations for effective FMEAs and RS 471 uses case study examples to allow attendees to practice FMEA facilitation and application skills. ReliaSoft Xfmea software is used for data management and reporting. Although these courses can be taken separately, we recommend taking them together since RS 471 builds upon the material presented in RS 470.

For those who have taken RS 470 previously in the 2-day format, the course content has been expanded considerably to include more examples and case studies and more information on related analyses (e.g. Process Flow Diagrams, DRBFM). It also provides participants with a better understanding of how FMEA fits into the overall reliability program and addresses key factors for creating an effective FMEA process. If your goal is to increase your knowledge and understanding of FMEA, then it is well worth the investment of time and money to re-take this course. For more information on the Effective FMEA Series, please visit
Upcoming Public Training Event Calendar
February 2010
February 22 - 26, 2010: MSMT Foundations in Tucson, AZ
March 2010
March 1 - 3, 2010: RS 522 Advanced System Reliability / Maintainability Analysis in Berlin, Germany
March 4 - 5, 2010: RS 490 Standards Based Reliability Prediction in Berlin, Germany
March 15 - 19, 2010: Effective FMEA Series (RS 470 & RS 471) in Tucson, Arizona
March 15 - 19, 2010: MSMT Foundations in Kuala Lumpur, Malaysia
March 15 - 17, 2010: RS 401(C) and RS 402 Life Data Analysis (Condensed) and Intro to Accelerated Testing in Pune, India
March 16 - 18, 2010: RS 522 Advanced System Reliability / Maintainability Analysis in Tucson, Arizona
March 22 - 23, 2010: RS 490 Standards Based Reliability Prediction in Singapore
March 24 - 26, 2010: RS 522 Advanced System Reliability / Maintainability Analysis in Singapore
April 2010
April 5 - 9, 2010: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Jakarta, Indonesia
April 7 - 9, 2010: International Applied Reliability Symposium in Berlin, Germany
April 19 - 21, 2010: RS 521 Advanced Accelerated Life Testing Analysis in Bangalore, India
April 19 - 23, 2010: MSMT Foundations in Stockport, United Kingdom
April 19 - 23, 2010: MSMT Foundations in Tucson, Arizona
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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