In this issue:

Issue 86, April 2008

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

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Hot Topics

Degradation Analysis in Destructive Testing - Part II
Degradation analysis is an important data analysis technique for projecting failure data from the degradation history of a quality or performance characteristic that is associated with the reliability of a product. This approach typically requires that the degradation be measured for multiple units over time. However, in some cases, destructive testing is necessary to obtain degradation measurements and taking multiple measurements over the life of the same unit is therefore not feasible. The previous month's issue of the Reliability HotWire presented an approach for handling such a data analysis problem and predicting a failure distribution model using ALTA 7. In this article an alternative method is presented using Weibull++ 7.

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Reliability Basics

Discussion of the Residual Sum of Squares in DOE
Variation occurs in nature, be it the tensile strength of a particular grade of steel, the caffeine content in your energy drink or the distance traveled by your vehicle in a day. Variations are also seen in the observations recorded during multiple executions of a process, even when conditions are kept as homogeneous as possible. The natural variations that occur in a process, even when all factors are maintained at the same level, are often termed noise. In Design of Experiments (DOE) analysis, a key goal is to study the effect(s) of one or more factors on measurements of interest (or responses) for a product or process. It thus becomes extremely important to distinguish the changes in the response caused by a factor from those caused by noise. A number of statistical methods, generally referred to as hypothesis testing, are available to achieve this. These methods normally involve quantifying the variability due to noise or error in conjunction with the variability due to different factors and their interactions. It is then possible to determine whether the changes observed in the response(s) due to changes in the factor(s) are significant. In this article, we will discuss different components of error and give an example of how the error and each of its components are defined and used in the context of hypothesis testing.

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Tool Tips
  • Can I edit the optimal solutions in DOE++s Optimization tab?
  • What functionality is available in the Tasks area of my XFRACAS Portal page?

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Latest Software Updates
DOE++ (1.0.1) has been released! In addition, new service releases are now available for Weibull++ (SR 7.5.4), ALTA (SR 7.5.4) and RENO (SR 1.0.10). 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 3/12/2008 7.5.4
ALTA 7 3/12/2008 7.5.4
DOE++ 3/12/2008 1.0.1
RENO 1 3/25/2008 1.0.10
Hot News

New Software Release! - ReliaSoft's DOE++ software was officially released in March and is now available for purchase. This powerful software package facilitates traditional Design of Experiments (DOE) techniques and also expands upon standard methods to provide the proper analysis treatment for interval and right censored data - offering a major breakthrough for reliability-related analyses! For more information about the product's features and applications, please visit


New DOE Training Seminar - Mark your calendars for June 2-4, 2008 to attend the RS 588 Design of Experiments (DOE) training seminar in Tucson. This three-day course begins with DOE fundamentals and continues with advanced concepts, principles and requirements. Participants will be thoroughly exposed to DOE through theoretical and hands-on sections that will allow them to perform DOE methods. They will also learn how to analyze data from such experiments, including factorial design, fractional factorial design, robust design, response surface methodology (RSM) and mixture design. For more information on this course, please visit


ARS Advanced Registration Deadline Act now to take advantage of the $200 discount for this year's International Applied Reliability Symposium, North America, which will be held June 17-20, 2008 at the Grand Sierra Resort in Reno, Nevada. Visit to register by April 23, 2008 for this special rate. Hotel rooms at the Grand Sierra Resort will also need to be reserved by May 18, 2008 to be eligible for the negotiated Symposium rate.


Whirlpool Corporate Partner License - Whirlpool Corporation has demonstrated its total commitment to reliability engineering practices by recently becoming an official ReliaSoft Global Corporate Partner. This agreement provides all Whirlpool employees around the world with full unlimited access to all standalone products offered directly by ReliaSoft as well as access to all ReliaSoft training material. Welcome aboard, Whirlpool! Learn more about ReliaSoft's Corporate Partner License option at

Upcoming Public Training Event Calendar
April 2008
April 14 - 15, 2008: RS 480 Reliability Centered Maintenance in Warsaw, Poland
April 17 - 18, 2008: International Applied Reliability Symposium in Chennai, India
April 21 - 25, 2008: MSMT Foundations in Tucson, Arizona
April 23 - 25, 2008: RS 521 Advanced QALT in Singapore
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 2 - 4, 2008: RS 588 Design of Experiments (DOE) in Tucson, Arizona
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
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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 contact us.


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