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

Issue 61, March 2006

*Hot Topics
*Reliability Basics
*Tool Tips
*Latest Software Updates
*Hot News
*Contribute to HotWire

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Hot Topics

Probabilistic Event and Risk Analysis with RENO

ReliaSoft's RENO is designed for probabilistic event and risk analysis. Using a graphical flowchart format, systems and/or scenarios can intuitively be built and then executed via simulation. RENO can also be considered as a "visual spreadsheet" that allows you to create and manipulate data and equations graphically, but with greater flexibility due to its ability to evaluate systems and scenarios that evolve over time.


The software supports the modeling of complex dependent probabilistic events. Applications include, but are not limited to, risk analysis, safety analysis, complex reliability modeling, maintenance, optimization and operational research problems. The following is an example that illustrates an application of RENO to assess the reliability of a system.

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Reliability Basics

Common Beta Hypothesis Test In Reliability Growth and Repairable Systems Analysis

When conducting a reliability growth or a repairable systems analysis in RGA 6 on data consisting of multiple systems, you expect that each of the systems performed in a similar manner. In particular, you would expect the interarrival rate of the failures across the systems to be fairly consistent. A statistical test, called the Common Beta Hypothesis (CBH), is available to test for this assumption.


This test is important because it warns the analyst about the possibility that the systems, which are assumed to be similar, are in fact different (i.e. have different behavior). If the test fails to support the assumption, the analyst should investigate the reasons for difference between the multiple systems and possibly split the data into different separate analysis. Note that in repairable analysis or reliability growth, the systems need to be in the same configuration all the time. In other words, if a fix or improvement is implemented in one system it should be implemented across all the systems to keep the consistency between the various systems and to avoid creating a non-homogenous sample. The CBH tests whether other differences are present among the systems. This article describes this test and provides an example to illustrate how the test can be applied.

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Tool Tips
  • Can the order of execution of Flag Markers in a RENO Flowchart be changed?
  • How can RCM++ and Xfmea help keep track of an analysis from start to finish?

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Latest Software Updates
A new service release is now available for ALTA (Version 6.5.2). To determine the compile revision of the application on your computer, select About from the Help menu. More Software Downloads...


Application Date Created Version
ALTA 3/8/06 6.5.2
ALTA Update N/A SR 6.5.2
Hot News
* Applied Reliability Symposium (North America) - Early registration for this popular annual event has been extended to April 14, 2006. All registrations prior to this date will get a 20% discount. This year's event will be held in Orlando, FL June 14 - 16, 2006. Registration information and a detailed Program Matrix can be obtained at:
* Seminar Matrix Update - ReliaSoft's Worldwide Seminar Calendar is now online! Over 70 public seminars, in four continents and four languages, have been scheduled for 2006. Explore our easy to use Seminar Calendar to quickly locate an event near you:
* Applied Reliability Symposium Sponsorship - This years International Applied Reliability Symposiums are offering a creative way to help your company demonstrate its commitment to reliability engineering. The ARS 2006 introductory sponsorship package provides your company with targeted visibility while also allowing a number of your engineers to attend the event at no additional cost. Send a quick message to if you are interested in benefiting your company and the engineering team with this simple solution.
* Simpsio Internacional de Confiabilidade (Brasil) South American engineers will soon be gathering in Salvador, Bahia, Brazil to share new applications, success stories and lessons learned in reliability and maintainability engineering. This year's Symposium will be held at the Bahia Othon Palace Hotel May 11 - 12, 2006. There is still time to register:

Special thanks goes out to our event sponsors, DaimlerChrysler, Alumar, Alcoa and Braskem, for their help in bringing this important information to the engineering community in South America.

Public Training Event Calendarr
March 2006

March 15 - 17, 2006: RS 480 - Introduction to RCM Principles and Applications in So Paulo, Brazil

March 20 - 24, 2006: MSMT Foundations in in Philippines

March 27 - 28, 2006: RS 480 - Introduction to RCM Principles and Applications in Tucson, Arizona

March 27 - 29, 2006: RS 522 - Advanced System Analysis and BlockSim in Tucson, Arizona

March 28 - 31, 2006: MSMT Foundations in in So Paulo, Brazil

March 30 - 31, 2006: RS 470 - FMEA/FMECA and Xfmea in Tucson, Arizona

April 2006

April 3 - 7, 2006: MSMT Foundations in Frankfurt, Germany

April 3 - 7, 2006: MSMT Foundations in Singapore

April 5 - 7, 2006: RS 525 - Advanced Probabilistic and Risk Decision Analysis and RENO in Tucson, Arizona

April 6 - 7, 2006: RS 588 - Design of Experiments in So Paulo, Brazil

April 10 - 11, 2006: RS 401 - Life Data Analysis and Weibull++ (Condensed) in Pune, India

April 11 - 13, 2006: RS 521 - Advanced QALT Data Analysis and ALTA PRO in in So Paulo, Brazil

April 24 - 28, 2006: MSMT Foundations in Tucson, Arizona

Contribute to HotWire
Contributions Welcomed
As always, your feedback and contributions are appreciated. ReliaSoft is able to provide the most user-friendly reliability software packages and support because we listen to our customers. This applies to our newsletters and publications as well. We welcome any suggestions or contributions you may have for Reliability HotWire. If you have a topic or article that you think would be useful to the readers of Reliability HotWire, feel free to contact us.

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