Defect evolution in a product line environment

TitleDefect evolution in a product line environment
Publication TypeJournal Articles
Year of Publication2004
AuthorsZelkowitz MV, Rus I
JournalJournal of Systems and Software
Pagination143 - 154
Date Published2004/02//
ISBN Number0164-1212
KeywordsEvolutionary software, Life and mission critical software, metrics, Process characterization, Product line development, Software independent verification and validation, Software safety and reliability, Space Shuttle program

One mechanism used for monitoring the development of the Space Shuttle flight control software, in order to minimize any risks to the missions, is the independent verification and validation (IV&V) process. Using data provided by both the Shuttle software developer and the IV&V contractor, in this paper we describe the overall IV&V process as used on the Space Shuttle program and provide an analysis of the use of metrics to document and control this process over multiple releases of this software. Our findings reaffirm the value of IV&V, show the impact of IV&V on multiple releases of a large complex software system, and indicate that some of the traditional measures of defect detection and repair are not applicable in a multiple-release environment such as this one.