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Sequential Probability Ratio Test for Reliability Demonstration

The Sequential Probability Ratio Test (SPRT) was developed by Abraham Wald more than a half century ago. It is widely used in quality control in manufacturing and detection of anomalies in medical trials. In this article, we will explain the theory behind this method and illustrate its use in reliability engineering, especially in reliability demonstration test design. An example using the SPRT report template in Weibull++ is provided.


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Finishing Touches on New Training Center

After months of planning and hard work, we are pleased to see our state-of-the-art Reliability Training Center (RTC) near completion at our headquarters in Tucson, AZ. When you first walk into the main auditorium, with its tiered seating for 45, it feels like the bridge of the Enterprise. There are remote controlled cameras, overhead microphones, dual projection screens, ergonomic seating and a myriad of outlets to plug in a phone, laptop and anything else you have with power. This new facility also includes a kitchen and patio for entertaining our guests during breaks. So sign up for a future class to see it for yourself! A full list of classes is available at


2015 ARS, North America Will Be in Tucson, AZ!

The 2015 ARS, North America, will be held June 2 - 5, 2015 in Tucson, Arizona. We are especially excited about this location because it is our hometown where it all started over 20 years ago. The resort we have picked out for you, Loews Ventana Canyon Resort, is a true gem as well. Please note that the deadline for submitting a presentation proposal is December 5th, 2014. For more information, please visit


Early Registration Discount for ARS India

Time is running out to take advantage of the 10% discount for early registration to this year’s International Applied Reliability Symposium in India. The Symposium will be held on November 12 – 14, 2014 in Bangalore, India. You must register before October 10, 2014 to receive this discount. In addition, we have posted hotel information for your planning purposes. For additional registration information, please visit

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