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The Risks of Using Failure Rate to Calculate Reliability Metrics

A mistake that is often made when calculating reliability metrics is trying to use the failure rate function instead of the probability of failure function (CDF). These two functions, along with the probability density function (pdf) and the reliability function, make up the four functions that are commonly used to describe reliability data. In this article we will provide a brief overview of each of these four functions, followed by a discussion of how to obtain the pdf, CDF and reliability functions from the failure rate function. Finally, we will present an example of the error that can be introduced in unreliability calculations by using an approximation based on the failure rate.


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Register Today to Save - 2017 ARDC India

Make your plans to attend the Applied Reliability and Durability Conference (ARDC) from August 9 - 11 in Pune, India. Register now until July 14th to receive a discount. This year's symposium offers reliability and durability sessions along with discussion panels. For more information about the event, visit our new website at


ReliaSoft Solutions at the ESREL Conference and ATE Expo

ReliaSoft will be exhibiting at the European Safety and Reliability Conference (ESREL) in Portorož, Slovenia on June 18 - 22, 2017 and at the Automotive Testing Europe Expo in Stuttgart, Germany on June 20 - 22, 2017. Visit us to talk with our experts and to learn more about our reliability and maintainability solutions. If you're not able to attend either event, you can learn more about ReliaSoft solutions at


ReliaSoft Training Courses at Your Site

Did you know? If you have multiple employees that need reliability training, HBM Prenscia can send our expert instructors to your organization. With an on-site seminar, you'll receive focused training on the topics that are critical to your projects, save your organization time and money, and you can choose an ideal time and location that meets your needs. For more information, visit

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