In this issue:

Issue 88, June 2008

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

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Hot Topics

An Example of Using Reliability DOE for Life Testing
Design of Experiments (DOE) is one of the important tools in Design for Six Sigma (DFSS) and Design for Reliability (DFR). However, there are difficulties with applying the traditional DOE analysis methods, such as ANOVA or linear regression for data from life tests. In this article, we will briefly explain why the traditional DOE analysis methods cannot be directly applied to life data, and then provide an example of how to use ReliaSoft's DOE++ to design a life test and analyze the data.

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Reliability Basics

Type I and Type II Errors and Their Applications
Type I and Type II errors are two well known concepts in quality engineering, which are related to hypothesis testing. Often engineers are confused by these two concepts simply because they have many different names. For example, Type I errors are also called 1) Producer’s risk, 2) False alarm, 3) False negative or 4) error. Type II errors are also called "Consumer’s risk," 2) Misdetection, 3) False positive or 4) error.

In this article, we will use two examples to clarify what Type I and Type II errors are and how they can be applied.

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Tool Tips
  • How can I tell if a transformation is required for my response in DOE++ and, if so, which one I should use?
  • Why is "Pnz" sometimes displayed in the results area of the Standard Folio Control Panel in Weibull++?

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Latest Software Updates
A new service release is now available for Weibull++ 7 Developer Edition (SR 7.0.3). More Software Downloads...


Application Date Created Version
Weibull++ Developer Edition    
Weibull++ 7 DE 5/1/08 7.0.3
Hot News
* Final Reminder: 2008 ARS, North America – There is still time to register, so don't miss out! Join us at the Grand Sierra Resort in Reno, Nevada on June 17-20, 2008 for the Applied Reliability Symposium. This year's conference has been expanded to include a pre-conference golf outing, an increase of choices with three unique presentation tracks, and one additional day of academic research-oriented presentations that cover the latest theoretical advances. For more information, please visit

Please call our sales office at 1.888.886.0410 to register by phone, or register online at To make hotel reservations, please call 1.800.648.5080 and request the Symposium rate (remember to check the hotel Web site at for Internet specials!).

* Certified Reliability Professional (CRP) Program - ReliaSoft's Certified Reliability Professional (CRP) program has been designed to distinguish professionals who have gained and successfully demonstrated unquestionable expertise in the field of reliability engineering. To achieve certification, candidates must complete a series of training courses focused on important reliability engineering topics, successfully apply the learned body of knowledge in the workplace and publicly present this expertise in an industry conference or journal. For more information about this certification program, please visit
* Congratulations to CRP Graduates - In recognition of outstanding achievement, we had the distinct honor and pleasure of publicly awarding seven individuals with the Certified Reliability Professional certification at the Applied Reliability Symposium in Brazil last month:
Name Country CRP Number Issue Date
Bezerra da Rocha Filho Brazil 15135 11/02/2007
Carlos Pallerosi Brazil 15813 04/10/2008
João Luis Reis e Silva Brazil 15012 05/07/2008
Fernando Quadrelli Brazil 15105 05/07/2008
Marcelo A. de Olivereira Brazil 15153 05/09/2008
Alessandra Lopes Carvalho Brazil 15099 05/09/2008
Pedro Paulo M. Vasconcellos Brazil 15023 05/14/2008
* Repairable Systems Analysis Training - RS 540 Reliability and Maintainability Analysis for Repairable Systems is a five-day course that establishes the fundamentals of life data analysis for reliability engineering by focusing on the application of key concepts and methodologies, including related theory, assumptions, mathematics and statistics. The course then presents an overview of repairable system analysis using different recurrent event data analysis approaches, fundamentals of Reliability Centered Maintenance (RCM) and advanced concepts and applications for repairable system analysis utilizing reliability block diagrams (RBDs). The next available courses will be held in Singapore, USA and Australia in the month of July. Our Worldwide Seminar Calendar includes dates, hotel and registration information:
Upcoming Public Training Event Calendar
June 2008
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
June 30 - July 4, 2008: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Singapore
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
August 2008
August 21 - 22, 2008: RS 480 Reliability Centered Maintenance in Chennai, India
August 25 - 29, 2008: MSMT Foundations in San Diego, California
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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