I. Stamelos, L. Angelis, A. Oikonomou, and G. L. Bleris, Code quality analysis in open source software development, Information Systems Journal, vol.97, issue.1, pp.43-60, 2002.
DOI : 10.1109/52.744561
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.102.7392

J. W. Paulson, G. Succi, and A. Eberlein, An empirical study of open-source and closed-source software products. Software Engineering, IEEE Transactions on, vol.30, pp.246-256, 2004.

J. Kuan, Open Source Software as Lead-User's Make or Buy Decision: A Study of Open and Closed Source Quality, Second Conference on The Economics of the Software and Internet Industries, 2003.

S. Raghunathan, A. Prasad, B. K. Mishra, and H. Chang-;, Open Source Versus Closed Source: Software Quality in Monopoly and Competitive Markets, IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans, vol.35, issue.6, pp.903-918, 2005.
DOI : 10.1109/TSMCA.2005.853493

R. A. Ghosh, Economic Impact of Open Source Software on Innovation and the Competitiveness of the Information and Communication Technologies Sector in the E, 2006.

E. Von-hippel and G. Von-krogh, Open Source Software and the 'Private-Collective' Innovation Model: Issues for Organization Science, SSRN Electronic Journal, vol.14, pp.209-223, 2003.
DOI : 10.2139/ssrn.1410789

P. Hales, Firefox use continues to rise in Europe, The Inquirer, 2006.

W. Scacchi, K. Lyytinen, P. Loucopoulos, J. Mylopoulos, and W. Robinson, Understanding Requirements for Open Source Software Design Requirements Engineering -A Multi-Disciplinary Perspective for the Next Decade, 2009.

K. J. Stewart and S. Gosain, The Impact of Ideology on Effectiveness in Open Source Software Development Teams, MIS Quarterly, vol.30, pp.291-314, 2006.

S. A. Ajila and D. Wu, Empirical study of the effects of open source adoption on software development economics, Journal of Systems and Software, vol.80, issue.9, pp.1517-1529, 2007.
DOI : 10.1016/j.jss.2007.01.011

A. Bonaccorsi and C. Rossi, Comparing motivations of individual programmers and firms to take part in the open source movement: From community to business, Knowledge, Technology & Policy, vol.74, issue.7, pp.40-64, 2006.
DOI : 10.4159/harvard.9780674424746

E. Raymond, The cathedral and the bazaar, Knowledge, Technology & Policy, vol.12, issue.3, pp.23-49, 1999.
DOI : 10.1007/s12130-999-1026-0

P. C. Rigby, D. M. German, and M. Storey, Open source software peer review practices, Proceedings of the 13th international conference on Software engineering , ICSE '08, pp.541-550, 2008.
DOI : 10.1145/1368088.1368162

Y. Ye and K. Kishida, Toward an Understanding of the Motivation of Open Source Software Developers, Proceedings of the 25th International Conference on Software Engineering, pp.419-429, 2003.

A. Mockus, R. T. Fielding, and J. D. Herbsleb, Two case studies of open source software development: Apache and Mozilla, ACM Transactions on Software Engineering and Methodology, vol.11, issue.3, pp.309-346, 2002.
DOI : 10.1145/567793.567795
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.20.2027

K. Schwaber, Agile Project Management with Scrum, 2004.

W. E. Deming, Quality, Productivity, and Competitive Position. MIT Center for Advanced Engineering Study, 1982.

W. E. Deming, Out of the Crisis. MIT Center for Advanced Engineering Study, 1986.

J. M. Juran, Planning for Quality, 1988.

P. B. Crosby, Quality is Free: The Art of Making Quality Certain, 1979.

A. Feigenbaum, Total quality control: engineering and management: the technical and managerial field for improving product quality, including its reliability, and for reducing operating costs and losses, 1961.

K. Ishikawa, What is total quality control? The Japanese way, 1985.

G. Tennant, Six Sigma: SPC and TQM in manufacturing and services, 2001.

D. A. Garvin, What does 'Product Quality' really mean?, Sloan Management Review, vol.1, pp.25-43, 1984.

B. W. Boehm, J. R. Brown, and M. Lipow, Quantitative evaluation of software quality, Proceedings of the 2nd international conference on Software engineering, 1976.

J. P. Cavano and J. A. Mccall, A Framework for the Measurement of Software Quality, Proceedings of the ACM Software Quality Workshop, pp.133-139, 1978.

J. A. Mccall, P. K. Richards, and G. F. Walters, Factors in Software Quality, National Technology Information Service, vol.1, issue.2 3, 1977.

G. Walsham, The Emergence of Interpretivism in IS Research, Information Systems Research, vol.6, issue.4, pp.376-394, 1995.
DOI : 10.1287/isre.6.4.376

A. L. Strauss and J. M. Corbin, Basics of Qualitative Research: Grounded Theory Procedures and Techniques, 1990.

A. Strauss and J. Corbin, Grounded Theory Methodology -An Overview, Handbook of Qualitative Research, pp.273-285, 1994.

A. Aksulu and M. Wade, A Comprehensive Review and Synthesis of Open Source Research, Journal of the Association for Information Systems, vol.11, pp.576-656, 2010.

D. Spinellis, A tale of four kernels, Proceedings of the 13th international conference on Software engineering , ICSE '08, pp.381-390, 2008.
DOI : 10.1145/1368088.1368140

E. Capra, C. Francalanci, and F. Merlo, An Empirical Study on the Relationship Between Software Design Quality, Development Effort and Governance in Open Source Projects, IEEE Transactions on Software Engineering, vol.34, issue.6, pp.765-782, 2008.
DOI : 10.1109/TSE.2008.68

C. A. Conley, Design for quality: The case of Open Source Software Development, Stern Graduate School of Business Administration, vol.PhD, p.43, 2008.

A. G. Koru and J. Tian, Comparing high-change modules and modules with the highest measurement values in two large-scale open-source products. Software Engineering, IEEE Transactions on, vol.31, pp.625-642, 2005.

T. Gyimothy, R. Ferenc, and I. Siket, Empirical validation of object-oriented metrics on open source software for fault prediction. Software Engineering, IEEE Transactions on, vol.31, pp.897-910, 2005.

A. G. Koru and H. Liu, Identifying and characterizing change-prone classes in two large-scale open-source products, Journal of Systems and Software, vol.80, issue.1, pp.63-73, 2007.
DOI : 10.1016/j.jss.2006.05.017

S. Koch and C. Neumann, Exploring the Effects of Process Characteristics on Products Quality in Open Source Software Development, Journal of Database Management, vol.19, issue.2, pp.31-57, 2008.
DOI : 10.4018/jdm.2008040102

L. Yu, S. R. Schach, K. Chen, G. Z. Heller, and J. Offutt, Maintainability of the kernels of open-source operating systems: A comparison of Linux with FreeBSD, NetBSD, and OpenBSD, Journal of Systems and Software, vol.79, issue.6, pp.807-815, 2006.
DOI : 10.1016/j.jss.2005.08.014

D. Barbagallo, C. Francalenei, and F. Merlo, The Impact of Social Networking on Software Design Quality and Development Effort in Open Source Projects, Proceedings of the International Conference on Information Systems, 2008.

I. Samoladas, I. Stamelos, L. Angelis, and A. Oikonomou, Open source software development should strive for even greater code maintainability, Communications of the ACM, vol.47, issue.10, pp.83-87, 2004.
DOI : 10.1145/1022594.1022598

A. H. Ghapanchi and A. Aurum, Measuring the Effectiveness of the Defect-Fixing Process in Open Source Software Projects, 2011 44th Hawaii International Conference on System Sciences, 2011.
DOI : 10.1109/HICSS.2011.305

Y. Kidane and P. Gloor, Correlating temporal communication patterns of the Eclipse open source community with performance and creativity, Computational and Mathematical Organization Theory, vol.32, issue.3, pp.17-27, 2007.
DOI : 10.1007/s10588-006-9006-3

Y. A. Au, D. Carpenter, X. Chen, and J. G. Clark, Virtual organizational learning in open source software development projects, Information & Management, vol.46, issue.1, pp.9-15, 2009.
DOI : 10.1016/j.im.2008.09.004

K. Crowston and B. Scozzi, Bug Fixing Practices within Free/Libre Open Source Software Development Teams, Journal of Database Management, vol.19, issue.2, pp.1-30, 2008.
DOI : 10.4018/jdm.2008040101
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.224.2744

A. G. Koru and J. Tian, Defect handling in medium and large open source projects. Software, IEEE, vol.21, pp.54-61, 2004.
DOI : 10.1109/ms.2004.12

D. G. Glance, Release criteria for the Linux kernel, First Monday, vol.9, issue.4, 2004.
DOI : 10.5210/fm.v9i4.1136

C. L. Huntley, Organizational learning in open-source software projects: an analysis of debugging data. Engineering Management, IEEE Transactions on, vol.50, pp.485-493, 2003.

S. Y. Sohn and M. S. Mok, A strategic analysis for successful open source software utilization based on a structural equation model, Journal of Systems and Software, vol.81, issue.6, pp.1014-1024, 2008.
DOI : 10.1016/j.jss.2007.08.034

Y. Zhou and J. Davis, Open source software reliability model: an empirical approach, Proceedings of the fifth workshop on Open source software engineering, pp.1-6, 2005.
DOI : 10.1145/1082983.1083273

L. Zhao and S. Elbaum, Quality assurance under the open source development model, Journal of Systems and Software, vol.66, issue.1, pp.65-75, 2003.
DOI : 10.1016/S0164-1212(02)00064-X

M. Aberdour, Achieving Quality in Open-Source Software, IEEE Software, vol.24, issue.1, pp.58-64, 2007.
DOI : 10.1109/MS.2007.2

T. J. Halloran and W. L. Scherlis, High Quality and Open Source Software Practices, Proceedings of the 2nd Workshop on Open Source Software Engineering, 2002.

M. Michlmayr, F. Hunt, and D. Probert, Quality Practices and Problems in Free Software Projects, Proceedings of the First International Conference on Open Source Systems, pp.24-28, 2005.

A. Mockus, R. T. Fielding, and J. Herbsleb, A case study of open source software development, Proceedings of the 22nd international conference on Software engineering , ICSE '00, 2000.
DOI : 10.1145/337180.337209

I. Samoladas, G. Gousios, D. Spinellis, and I. Stamelos, The SQO-OSS Quality Model: Measurement Based Open Source Software Evaluation, 4th International Conference on Open Source Systems (OSS2008), pp.237-248, 2008.
DOI : 10.1007/978-0-387-09684-1_19
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.144.2121

J. Deprez and S. Alexandre, Comparing Assessment Methodologies for Free/Open Source Software: OpenBRR and QSOS, pp.189-203, 2008.
DOI : 10.1007/978-3-540-69566-0_17

K. Crowston, J. Howison, and H. Annabi, Information systems success in free and open source software development: theory and measures, Software Process: Improvement and Practice, pp.123-148, 2006.
DOI : 10.5210/fm.v6i12.902
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.157.7677

B. Wray and R. Mathieu, Evaluating the performance of open source software projects using data envelopment analysis, Information Management & Computer Security, vol.16, issue.5, p.449, 2008.
DOI : 10.1109/TEM.2004.830843

V. Del-bianco, L. Lavazza, S. Morasca, D. Taibi, and D. Tosi, The QualiSPo approach to OSS product quality evaluation, Proceedings of the 3rd International Workshop on Emerging Trends in Free/Libre/Open Source Software Research and Development, FLOSS '10, pp.23-28, 2010.
DOI : 10.1145/1833272.1833277

M. Soto and M. Ciolkowski, The QualOSS open source assessment model measuring the performance of open source communities, 2009 3rd International Symposium on Empirical Software Engineering and Measurement, pp.498-501, 2009.
DOI : 10.1109/ESEM.2009.5314237

J. Deprez, F. F. Monfils, M. Ciolkowski, and M. Soto, Defining Software Evolvability from a Free/Open-Source Software Perspective, Third International IEEE Workshop on Software Evolvability, pp.29-35, 2007.
DOI : 10.1109/software-evolvability.2007.6

R. Glott, A. Groven, K. Haaland, and A. Tannenberg, Quality Models for Free/Libre Open Source Software Towards the “Silver Bullet”?, 2010 36th EUROMICRO Conference on Software Engineering and Advanced Applications, pp.439-446, 2010.
DOI : 10.1109/SEAA.2010.23

A. Groven, K. Haaland, R. Glott, and A. Tannenberg, Security measurements within the framework of quality assessment models for free/libre open source software, Proceedings of the Fourth European Conference on Software Architecture Companion Volume, ECSA '10, pp.229-235, 2010.
DOI : 10.1145/1842752.1842796

M. Michlmayr, Software Process Maturity and the Success of Free Software Projects, Proceeding of the 2005 conference on Software Engineering: Evolution and Emerging Technologies, pp.3-14, 2005.

C. M. Schweik, R. C. English, M. Kitsing, and S. Haire, Brooks' Versus Linus' Law: An Empirical Test of Open Source Projects, Proceedings of the 2008 international conference on Digital government research, pp.423-424, 2008.

A. Tiwana, The Influence of Software Platform Modularity on Platform Abandonment: An Empirical Study of Firefox Extension Developers, Terry School of Business, 2010.

M. Glinz, On Non-Functional Requirements, 15th IEEE International Requirements Engineering Conference (RE 2007), pp.21-26, 2007.
DOI : 10.1109/RE.2007.45
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.470.5284