An empirical validation of software cost estimation models
Communications of the ACM
The Use of Software Complexity Metrics in Software Maintenance
IEEE Transactions on Software Engineering
A Controlled Expeniment on the Impact of Software Structure on Maintainability
IEEE Transactions on Software Engineering
Managing the software process
Software complexity: measures and methods
Software complexity: measures and methods
An Entropy-Based Measure of Software Complexity
IEEE Transactions on Software Engineering - Special issue on software measurement principles, techniques, and environments
Software complexity and maintenance costs
Communications of the ACM
Understanding and predicting the process of software maintenance release
Proceedings of the 18th international conference on Software engineering
An Economic Model to Estimate Software Rewriting and Replacement Times
IEEE Transactions on Software Engineering
Lessons from open-source software development
Communications of the ACM
An assessment and comparison of common software cost estimation modeling techniques
Proceedings of the 21st international conference on Software engineering
Extreme programming explained: embrace change
Extreme programming explained: embrace change
A Critique of Software Defect Prediction Models
IEEE Transactions on Software Engineering
Experimentation in software engineering: an introduction
Experimentation in software engineering: an introduction
Software Engineering Economics
Software Engineering Economics
Fundamentals of Software Engineering
Fundamentals of Software Engineering
The Cathedral and the Bazaar
Software Maintenance Management
Software Maintenance Management
Empirically Guided Software Effort Guesstimation
IEEE Software
Evaluating Software Degradation through Entropy
METRICS '01 Proceedings of the 7th International Symposium on Software Metrics
The Art of UNIX Programming
Entropies as Measures of Software Information
ICSM '01 Proceedings of the IEEE International Conference on Software Maintenance (ICSM'01)
The software maintenance project effort estimation model based on function points
Journal of Software Maintenance: Research and Practice
Balancing Agility and Discipline: A Guide for the Perplexed
Balancing Agility and Discipline: A Guide for the Perplexed
A Quantitative Evaluation of Maintainability Enhancement by Refactoring
ICSM '02 Proceedings of the International Conference on Software Maintenance (ICSM'02)
The Chaos of Software Development
IWPSE '03 Proceedings of the 6th International Workshop on Principles of Software Evolution
Software Cost Estimation through Conceptual Requirement
QSIC '03 Proceedings of the Third International Conference on Quality Software
A Survey of Software Refactoring
IEEE Transactions on Software Engineering
Innovation Happens Elsewhere: How and Why a Company Should Participate in Open Source
Innovation Happens Elsewhere: How and Why a Company Should Participate in Open Source
An Empirical Study of Open-Source and Closed-Source Software Products
IEEE Transactions on Software Engineering
A Software Product Line Life Cycle Cost Estimation Model
ISESE '04 Proceedings of the 2004 International Symposium on Empirical Software Engineering
Comparing Uniform and Flexible Policies for Software Maintenance and Replacement
IEEE Transactions on Software Engineering
The need for effort estimation models for open source software projects
5-WOSSE Proceedings of the fifth workshop on Open source software engineering
Effort estimation by characterizing developer activity
Proceedings of the 2006 international workshop on Economics driven software engineering research
Indirectly predicting the maintenance effort of open-source software: Research Articles
Journal of Software Maintenance and Evolution: Research and Practice
Evaluating Software Engineering Processes in Commercial and Community Open Source Projects
FLOSS '07 Proceedings of the First International Workshop on Emerging Trends in FLOSS Research and Development
IEEE Transactions on Software Engineering
The transformation of open source software
MIS Quarterly
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Previous contributions in the empirical software engineering literature have consistently observed a quality degradation effect of proprietary code as a consequence of maintenance. This degradation effect, referred to as entropy effect, has been recognized to be responsible for significant increases in maintenance effort. In the Open Source context, the quality of code is a fundamental design principle. As a consequence, the maintenance effort of Open Source applications may not show a similar increasing trend over time. The goal of this paper is to empirically verify the entropy effect for a sample of 4,289 community Open Source application versions. Analyses are based on the comparison with an estimate of effort obtained with a traditional effort estimation model. Findings indicate that community Open Source applications show a slower growth ofmaintenance effort over time, and, therefore, are less subject to the entropy effect.