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Software Reliability Engineering Tool Nederlandse Testdag 27 november 2008 Alessandro di Bucchianico, Lime – TU/e Ed Brandt, Refis VOF
2 2008© Refis/Lime-TU/e Definition of “Reliability” "The probability that an item will perform a required function without failure under stated conditions for a stated period of time”
3 2008© Refis/Lime-TU/e Reliability growth curve 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0, interval reliability period = 5
4 2008© Refis/Lime-TU/e
5 2008© Refis/Lime-TU/e
6 2008© Refis/Lime-TU/e Step 1: Data collection document data sources record data collection procedures clean-up data
7 2008© Refis/Lime-TU/e Step 1: Data collection
8 2008© Refis/Lime-TU/e Step 1: Data collection
9 2008© Refis/Lime-TU/e
© Refis/Lime-TU/e Step 2: Determine Growth formal tests (Laplace, MIL-HB, LRT,…) time cumulative number of defects
© Refis/Lime-TU/e Step 3: Initial Model Selection
© Refis/Lime-TU/e Step 4: Estimate Models parameters cumulative number of defects likelihood MLLS time
© Refis/Lime-TU/e Step 5: Validate Model goodness-of-fit plots (TTT-plot, u-plot, QQ-plot, residual plots) goodness-of-fit tests (Kolmogorov, Zhao-Wang) time cumulative number of defects maximal absolute deviation
© Refis/Lime-TU/e Step 6: Interpret Model time cumulative number of defects use confidence bounds to learn about precision
© Refis/Lime-TU/e SREtool: goals provide support for software reliability analyses enable to apply best practices from statistics make available state-of-the-art statistical algorithms
© Refis/Lime-TU/e SREtool: features available for Windows, Unix and Linux import and export functions data editor wizard for initial model selection consistency check on data
© Refis/Lime-TU/e SREtool: implementation statistical procedures written in R R is open source, free statistics software R is maintained by a core group of world- class experts in computational statistics interface written in Java combination of R and Java using tool kit from University of Augsburg (Prof. Unwin)
© Refis/Lime-TU/e Sample data cumulatief aantal defects testinterval (dagen) aantal defects basis gegevens t/m 8/11 basis gegevens t/m 16/11 geschat aantal defects Yamada S-shaped
© Refis/Lime-TU/e Conclusions statistics can be a useful additional method to evaluate software reliability a new tool will soon be available for software reliability analyses
© Refis/Lime-TU/e Some of Refis clients and services Reliability analysis Quality metrics dashboard Test and quality management Process improvement
© Refis/Lime-TU/e Merellaan AK Bilthoven T F M W E Postbus MB Eindhoven T F W E
Microsoft Access 2007 Advanced Level. © Cheltenham Courseware Pty. Ltd. Slide No 2 Forms Customisation.
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1 Note content copyright © 2004 Ian Sommerville. NU-specific content copyright © 2004 M. E. Kabay. All rights reserved. Verification & Validation IS301.
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1 Note content copyright © 2004 Ian Sommerville. NU-specific content copyright © 2004 M. E. Kabay. All rights reserved. Configuration Management IS301.
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STATISTICS HYPOTHESES TEST (I) Professor Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan University.
Chap 7-1 Statistics for Business and Economics, 6e © 2007 Pearson Education, Inc. Chapter 7 Sampling and Sampling Distributions Statistics for Business.
©Ian Sommerville 2000CS 365 Critical Systems ValidationSlide 1 Chapter 21 Critical Systems Validation.
1 Test documentation and Test case design Iana Mourza QA Lead/Release Lead VMware, Inc
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©Ian Sommerville 2000Software Engineering, 6th edition. Chapter 29Slide 1 Chapter 29 Configuration Management.
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Design and Evaluation of an Autonomic Workflow Engine Thomas Heinis, Cesare Pautasso, Gustavo Alsonso Dept. of Computer Science Swiss Federal Institute.
1 Notes content copyright © 2004 Ian Sommerville. NU-specific content copyright © 2004 M. E. Kabay. All rights reserved. Software Requirements IS301 –
© Telelogic AB 1 Managing Change From Customer Request to Implementation Jean-Louis Vignaud & Dominic Tavassoli.
1 Implementing Internet Web Sites in Counseling and Career Development James P. Sampson, Jr. Florida State University Copyright 2003 by James P. Sampson,
1 Assessing Evidence Reliability In Performance Audits NSAA April 14, 2008.
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