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Understanding the Effect of the Beta Parameter on Demonstration Testing

Reliability demonstration tests are some of the most commonly performed tests in reliability programs. Typically set up as zero failure tests, their design involves determining the required sample size and test time per unit in order to demonstrate a component's target reliability at a desired confidence level. In many cases, one of the inputs required to design such a test is the underlying failure distribution of the component along with a parameter of that distribution. If the Weibull distribution is used, this parameter is the shape parameter beta. Some questions one might ask are "What is the effect of the assumed beta on the test design?" and "What values will produce more conservative results?" This article will attempt to answer these questions through a test design example.


Read the Latest Reliability News

Newest Addition to our Streaming Quick Start Guides

We are pleased to announce that the Lambda Predict 9 Quick Start Guide is now available as a collection of six online videos. This quick start guide has been designed to help you explore many of the software's key features by working through step-by-step instructions. These free videos are conveniently available at


Call for Presenters - ARS North America

Now that you have spent years developing and polishing your reliability engineering skills, we want to give you an opportunity to discuss your experiences with colleagues in the discipline. The 2015 International Applied Reliability Symposium, North America will be held June 2 - 4, 2015 in Tucson, Arizona. This annual event provides a forum for expert presenters from industry and government to come together with reliability practitioners from all over the world to discuss the application of reliability principles to meet real world challenges. You are invited to submit presentation proposals by December 5, 2014. The primary author for each presentation delivered at the Symposium will receive complimentary registration to the event and the opportunity to win one of the Excellent Presentation Awards. For more information and the required proposal submission form, please visit


Congratulations to the 2014 ARS Asia Pacific Excellent Presentation Award Winners!

We are pleased to announce the recipients of the Excellent Presentation Awards from the Applied Reliability Symposium Asia Pacific in Shanghai earlier this month. The award winners were selected based on votes cast by Symposium attendees.

  • Gold - Peng Wang from Pratt & Whitney
    Repairable System Reliability Modeling and Failure Forecast for Aerospace Engineering Systems
  • Silver - Shengjin Wang from Focused Photonics Inc.
    Effectively Implementing Reliability Engineering in Small-to-Medium Enterprises
  • Bronze - Li Xiupeng from Philips Lighting
    Optimize LM-80 to Cover New LEDs Lumen Degradation Model

A big thank you to all of our presenters, and congratulations to the award winners!

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