Reliability HotWire: eMagazine for the Reliability Professional
In this issue:

Issue 49, March 2005

*Hot Topics
*Reliability Basics
*Tool Tips
*Hot News
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Hot Topics

Using Warranty Return Data to Compare Different Product Designs

Warranty data analysis is crucial for predicting the quantity of products that will be returned under warranty. Warranty data analysis conducted using Weibull++ 6 can allow an organization to make the most efficient allocation of resources to warranty services provision. This allows you to anticipate customer support needs and take the necessary steps to insure customer satisfaction with the warranty process. Warranty data analysis helps in quantifying the number of spare parts or replacement units to stock or supply to distributors. It also helps in scheduling and planning for service, shipping and distribution personnel and in budgeting for all the warranty service needs.

Warranty data analysis can also be performed to compare different designs of a product. By comparing return data of different versions of a product (different designs or designs containing components from different suppliers), you can get a clear picture about what number of returns to expect depending on the version (design) of the product and can make a more informed decision about which design is more reliable.

To read more, see 

Reliability Basics

Introduction to the Crow-AMSAA Reliability Growth Model

In "Reliability Analysis for Complex, Repairable Systems" (1974), Dr. Larry H. Crow noted that the Duane model could be stochastically represented as a Weibull process, allowing for statistical procedures to be used in the application of this model in reliability growth. This statistical extension became what is known as the Crow-AMSAA (N.H.P.P.) model. This method was first employed by the U.S. Army Materiel Systems Analysis Activity (AMSAA). It is frequently used on systems when usage is measured on a continuous scale. It can also be applied for high reliability, a large number of trials and one-shot items. Test programs are generally conducted on a phase by phase basis. The Crow-AMSAA model is designed for tracking the reliability within a test phase and not across test phases.

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Tool Tips
  • Can I use Lambda Predicts parts libraries without having the Library panel open?

  • Is there an easy way to change the operating conditions for multiple components in Lambda Predict?

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Hot News

Applied Reliability Symposium  - Once again, the annual International Applied Reliability Symposium is approaching. Set your calendar for this special event in Reliability Engineering that will take place from Wednesday, May 18th to Friday, May 20th. Twenty-two presentations and four tutorials will be presented at this year's Symposium with keynote speaker Vice Admiral Scott Fry speaking on the morning of May 19th. The 2005 Symposium will be held at the Catamaran Resort on Mission Bay in San Diego, California. To get more information on the San Diego area, see the San Diego Convention & Visitor's Bureau. Register for the Symposium at:

Reminder: Through a special arrangement with the hotel, the reduced rate of $129.00 per night (which is also the current government rate) is available for seminar participants. Rooms must be reserved by April 27, 2005 to be eligible for this rate and guaranteed availability.


On-Site Training Advantage Did you know that if your schedule conflicts with ReliaSoft's public courses, or if your organization requires customized training, you can contact ReliaSoft to discuss on-site seminar options that are available for multiple reliability topics? There are several advantages to doing this, including the ability to openly discuss your organization's particular issues and objectives during the course, as well as economic advantages if you plan to train multiple people simultaneously. Information about on-site seminars is available at:

On-site seminars can be quickly arranged and are lauded for their flexibility in finding solutions to your specific reliability needs. The top quality instructors at ReliaSoft will guide you in solving your toughest reliability problems and can result in finding new ways for your company to improve its products while saving money. If you have a need for on-site training, ReliaSoft invites you to make an appointment today.


Lambda Predict is Officially Released ReliaSoft Corporation has promised to be the industry leader in reliability engineering R&D, software and services that combine the latest theoretical advances with essential tools for the practitioner in the field. In our latest endeavor to be a total reliability solutions company, ReliaSoft is pleased to announce the much-anticipated release of Lambda Predict, a software package dedicated to standards based reliability prediction analysis. Get details about Lambda Predict at:

ReliaSoft's Lambda Predict software supports all of the major standards for reliability prediction analysis, including MIL-HDBK-217, Bellcore, NSWC-98, China 299B and RDF 2000. The software provides extensive component libraries, calculated results, plots, print-ready reports and more! There are numerous user-defined fields so previously tested components can also be incorporated to provide a more accurate analysis. Download a demonstration copy of Lambda Predict today at!


Brazil's Regional Symposium Reliability symposia are great for learning new techniques on improving reliability. Improved reliability techniques add up to cost savings that filter down to you. If your company has engineering teams or associates in South America, dont let them miss Brazils Regional Reliability Symposium, held June 16 - 17 in Rio de Janeiro, Brazil. This seminar will be delivered in Portuguese and English and all are welcome to attend. Help your company and your associates take advantage of this event by forwarding them the news. Learn more at:

Public Training Event Calendar
April 2005
April 4 - 6, 2005: Advanced System Reliability, Maintainability and Availability Analysis in Tucson, Arizona
April 7 - 8, 2005: Failure Modes, Effects and Criticality Analysis and Xfmea in Tucson, Arizona
April 25 - 29, 2005: MSMT Foundations in Tucson, Arizona
April 27 - 29, 2005: Advanced System Reliability, Maintainability and Availability Analysis in Singapore
May 2005
May 2 - 6, 2005: MSMT Foundations in Melbourne, Australia
May 18 - 20, 2005: 2005 International Applied Reliability Symposium in San Diego, California
June 2005
June 6 - 7, 2005: Failure Modes, Effects and Criticality Analysis and Xfmea in Singapore
June 8 - 10 2005: QALT Boot Camp and Reliability Growth Analysis and RGA in Tucson, Arizona
June 16 - 17, 2005: 2005 International Applied Reliability Symposium, South America in Rio de Janeiro, Brazil
June 27 - July 1, 2005: MSMT Foundations in Manchester, UK
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