walt scacchi institute for software research university of...
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Walt ScacchiInstitute for Software ResearchUniversity of California, Irvine
Irvine, CA [email protected]
http://www.ics.uci.edu/~wscacchi/Presentations/OSS-Requirements
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• Research methodology• Community characteristics• Software Requirements process• Open source processes for Requirements• Software Informalisms• Implications• Conclusions
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• Prior empirical (case) studies of Open SourceSoftware Development (OSSD) Projects– Mockus, Fielding, Herbsleb, 2000, 2002, Apache httpd
server– Reis and Fortes, 2002, Mozilla Web browser– Schach et al., 2002; Holt et al., 2000, Linux Kernel– Koch and Schneider 2001; German 2002, GNOME User
Interface– Jorgensen, 2001, FreeBSD operating system– Garg et al., 2002, OSSD (“progressive open source”)
within HP
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• Individual case studies: significant details, butlimited (and premature) generalization, little/nocomparative analysis– Halloran and Scherlis, 2002, comparative study of
software tools and code volume in eleven OSSDprojects, all in one domain (Internet infrastructure)
• No studies that examine multiple OSSD projects inmultiple domains– Such studies would offer higher degree of comparative
analyses and generalization of results
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• Comparative case studies– Multiple open software development projects
• Across four communities– Two research oriented– Two development oriented
• Qualitative (“grounded theory”) techniques• Analyzing and modeling
– development processes– work practices– community structures
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• According to Steve Ballmer (CEO, Microsoft)– "We have to compete with free software, on
value, but in a smart way. We cannot price atzero, so we need to justify our posture andpricing. Linux isn't going to go away--our job isto provide a better product in the marketplace."
– "Linux is not about free software, it is aboutcommunity”(emphasis added).
– London, 24 September 2002, speaking on MS, its “Most ValuedProfessionals” (MVPs), and “shared source” vs. “open source”
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• Development oriented domains– Networked computer games– Internet infrastructure
• Research oriented domains– Astrophysics/deep space imaging– Academic software design
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• Classic Requirements Engineering Process– Elicitation– Analysis– Specification and modeling– Validation– Communicating and managing
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Open source processes for Requirements• Post-hoc assertion of requirements+design• Reading, sense-making, accountability• Continually emerging webs of discourse• Condensing and hardening discourse• Global access to discourse
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Open source processes for Requirements
• OSS Requirements are– not explicit– not formal
• QED, OSS Requirements embedded within“informalisms”
• Example OSS informalisms follow
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Open source processes for Requirements
• Elicitation• Analysis
• Specification andmodeling
• Validation
• Communicating andmanaging
• Post-hoc assertion• Reading, sense-
making, accountability• Continually emerging
webs of discourse• Condensing and
hardening discourse• Global access to
discourse
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• Community communications– Threaded discussion forums– Email (list servers)– Newsgroups– IRChat/Instant messages– Community digests (“Kernel Cousins”)
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• Scenarios of Usage as linked Web pages
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• How-To guides, To-Do lists, FAQs• Traditional software user documentation
– Unix/Linux man pages• External publications
– trade articles– scholarly research papers– books (cf. O’Reilly Books)
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• Open Software Web Sites– Community Web sites– Community Software Web sites– Project Web sites– Source code Webs/Directories
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• Software bug reports– Ad hoc report Web– Bugzilla (database tracking)
• Issue tracking– Issuezilla
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• Software extension mechanisms– Inter-application scripting
• Csh, Perl, Python, Tcl, scripting• Pipelines (cf. CXCDS)
– Intra-application scripting (e.g., UnrealScript)– Plug-in architectures
• Apache server architecture
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• Open source software licenses– GNU Public License (GPL)– Lesser/Library GPL (LGPL)– Artistic License– Mozilla Public License (MPL)– SUN Public License (SPL)– and 25 more (http://opensource.org)– “Creative Commons” Project at Stanford Law
School developing public license framework
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• Software informalisms are the media ofsoftware requirements
• Software informalisms are the subject ofsoftware requirements
• OSS Requirements are implied activities orcapabilities
• (Re)reading and reviewing informalisms is aprerequisite to writing open software
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• Developing open software requirements is acommunity building process– not just a technical development process– open source peer reviewing creates a community
of peers• OSSD processes often iterate daily versus
infrequent singular (milestone) SLC events– frequent, rapid cycle time (easier to improve) vs.
infrequent, slow cycle time (hard to improve)
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• Determining the quality of open softwarerequirements:– not targeted to consistency, completeness,
correctness– instead focusing attention to community
building, freedom of expression, ease ofinformalism navigation (traceability), implicitvs. explicit informalism structuring
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• Developing open software requirements isdifferent than requirements engineering– not better, not worse, but different and new– more social, more accessible, more convivial
• Open source software systems don’t needand probably won’t benefit from classicsoftware requirements engineering.
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• Need to integrate OSSD with SE– development infrastructure (tools and environments)– development processes– developer community
– across multiple domains• Scientific research• Commercial development
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• People use OSS development tools to create,update, distribute, or browse OSS informalisms
• OSSD tool taxonomy:– Seven level hierarchy; more than 40 tool types– http://www.ics.uci.edu/~wscacchi/Software-
Process/Open-Software-Process-Models/Open-Source-Software-Tools.html
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• Project collaborators:– Mark Ackerman, UMichigan,– Margaret Ellliot, Ph.D., Mark Bergman,
Xiaobin Li, UCI-ISR– Julia Watson, The Ohio State University
• Funding support:– National Science Foundation, IIS#-0083075, ITR#-
#0205679– Defense Acquisition University, N487650-27803
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• W. Scacchi, Understanding the Requirements for Developing Open SourceSoftware, IEE Proceedings--Software, 149(1), 24-39, 2002.http://www.ics.uci.edu/~wscacchi/Papers/New/Understanding-OS-Requirements.pdf
• W. Scacchi, Exploring Open Source System Acquisition Processes andArchitectures, Final Report, June 2002,http://www.ics.uci.edu/~wscacchi/ProjectReports/DAU-Final-Report-2002.pdf
• W. Scacchi, Open EC/B: A Case Study in Electronic Commerce and OpenSource Software Development, Final Report, July 2002,http://www.ics.uci.edu/~wscacchi/ProjectReports/CRITO-Final-Report-2002.pdf
• W. Scacchi, Is Open Source Software Development Faster, Better, and Cheaperthan Software Engineering?, 2nd Workshop on Open Source SoftwareEngineering, Orlando, FL, May 2002,http://www.ics.uci.edu/~wscacchi/Papers/New/ICSE02-Workshop-Scacchi-01.pdf