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Conditional Reliability for a System

Engineers are often asked to estimate the reliability of not just new systems, but also of systems that have already spent some time in the field. If one wants to do this estimation using a bottom-up approach with the help of a reliability block diagram in BlockSim (i.e., estimating system reliability using component-level information of the system), then care must be taken as to how that calculation is performed in order to avoid incorrect results.


In some cases, one can compute the conditional reliability of a system using BlockSim's QCP via one of two methods: 1) Using the conditional reliability function with all blocks set to a current age of zero, or 2) Using the reliability function with all blocks set to a current age of T. In other cases, the conditional reliability can be computed using only the first method. In this article we will discuss some simple systems and the methods that are applicable for each case.


Read the Latest Reliability News

Join Us for the ARS Europe in Milan, Italy

The 2017 Applied Reliability Symposium (ARS) Europe, which will be held from April 19 – 21, 2017 in Milan, Italy, offers a variety of presentations, tutorials and discussion panels. Start planning your event today! You can find Program Matrix details, including dates and times, at:


New Reliability and Durability Education Opportunities at ARS NA

It's time to start planning your trip to Chicago, IL for the Applied Reliability Symposium North America on June 13 – 15, 2017. This year's event will be packed with three tracks focused on reliability, maintainability, durability and fatigue. In addition to twenty seven presentations, four tutorials and four discussion panels, we offer free sessions in reliability and durability/fatigue before the conference begins. Find more information about the ARS program and the optional free sessions at:


Act now to save $200 on ARS registration costs. Get the early registration discount until April 28, 2017. More details at:


ReliaSoft Solutions at MARCON 2017 Conference

HBM Prenscia is exhibiting at the MARCON 2017 Conference in Knoxville, Tennessee on March 6 - 9, 2017. Visit us at the HBM Prenscia booth to talk with our experts and to learn more about reliability and maintenance engineering solutions for your company. If you're not able to attend the conference, you can learn more about ReliaSoft's solutions at


Present at the ARS India or Asia Pacific

The Applied Reliability Symposium is actively seeking presenters for upcoming events in Pune, India and Singapore. For both events, we are adding a third track focused on durability and fatigue, alongside two full tracks of reliability and maintainability presentations.


ARS Asia Pacific will take place on October 11 - 13, 2017 in Singapore. We are still accepting proposals for this symposium until April 7, 2017. For deadlines and forms, visit:


This is also the last month to submit a presentation proposal for ARS India, which will be held in Pune, India on August 9 - 11, 2017. The ARS India proposal deadline is March 24, 2017. For more info, visit:

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