NDLI: A comparison of PM2 and crow extended growth planning models

Content Provider	IEEE Xplore Digital Library
Author	Calomeris, M. Herbert, N.
Copyright Year	2013
Description	Author affiliation: ManTech Int. Corp., Belcamp, MD, USA (Calomeris, M.) \|\| U.S. Army Materiel Syst. Anal. Activity, AMXAA-LR, Aberdeen Proving Ground, MD, USA (Herbert, N.)
Abstract	Reliability growth planning is an important part of the reliability growth process. Its purpose is to provide achievable benchmarks throughout developmental testing in order to evaluate whether the project is on track to meet its requirement. Different models produce different growth curves. This paper compares two popular models, the Planning Model Based on Projection Methodology (PM2) and Crow Extended (CE), and highlights several features and patterns that are inherent to each of them through examples. Crow Extended was found to consistently model more aggressive growth based on fewer expected problem failure modes than PM2 in the early phases of a test. Given that design for reliability techniques are implemented specifically to mitigate the highly-significant problem failure modes that lead to aggressive early growth, a program that has designed for reliability should not exhibit the type of growth curve modeled by CE. Such a model will show the program to be constantly failing its benchmarks. In contrast, PM2 curves tend to be more plausible, with relatively consistent, moderate growth. A non-aggressive approach would be preferable for most planning purposes, as both moderate and aggressive growth programs can achieve the benchmarks. The shape parameter used in CE is based on historical values, and as such, has a certain amount of subjectivity in its estimation. Varying the parameter within the acceptable bounds of error had a considerable effect on the amount of test time required for the CE model to meet the reliability goal.
Sponsorship	IEEE Reliability Soc.
Starting Page	1
Ending Page	6
File Size	1386220
Page Count	6
File Format	PDF
ISBN	9781467347099
ISSN	0149144X
e-ISBN	9781467347112
DOI	10.1109/RAMS.2013.6517684
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Schedules Delays Reliability engineering Mathematical model Software reliability management tool reliability growth planning models risk analysis
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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