@article {Koch2008345,
	title = {Effort modeling and programmer participation in open source software projects},
	journal = {Information Economics and Policy (Empirical Issues in Open Source Software)},
	volume = {20},
	number = {4},
	year = {2008},
	note = {"Using a two-step approach, first a detailed case study on one project, GNOME, will be undertaken, then a large data set retrieved from a project hosting site, SourceForge.net, will be used to validate the results."

CVS was the main source of data

"e-mails sent to the different project discussion lists were identified as an additional source of information especially on communication and coordination besides the CVS-repository"

basic counts were calculated for developer discussion levels},
	month = {12/2008},
	pages = {345 - 355},
	abstract = {This paper develops models for programmer participation and effort estimation in open source software projects and employs the results to assess the efficiency of open source software creation. Successful development of such models will be important for decision makers of various kinds. We propose hypotheses based on a prior case study on manpower function and effort modeling. A large data set retrieved from a project repository is used to test these hypotheses. The main results are that if Norden-Rayleigh-based approaches are used, they need to be complemented in order to account for the addition of new features during a product life cycle, and that programmer-participation based effort models result in distinctly lower estimations of effort than those based on output metrics, such as lines of code.},
	keywords = {cvs, developers, email, email archives, gnome, lines of code, scm, Software repository mining, source code, sourceforge},
	issn = {0167-6245},
	doi = {DOI: 10.1016/j.infoecopol.2008.06.004},
	url = {http://www.sciencedirect.com/science/article/B6V8J-4SSND1J-1/2/c857fa1493e19aa7fe4297dedb077b3a},
	attachments = {https://flosshub.org/sites/flosshub.org/files/KochEffortModeling.pdf},
	author = {Koch, Stefan}
}
@conference {624,
	title = {Exploring the Effects of Coordination and Communication Tools on the Efficiency of Open Source Projects using Data Envelopment Analysis},
	booktitle = {OSS2007: Open Source Development, Adoption and Innovation (IFIP 2.13)},
	series = {IFIP International Federation for Information Processing },
	volume = {234/2007},
	year = {2007},
	note = {"based on the date january 8, 2007, we selected the 30 most often downloaded projects from Sourceforge.net"},
	month = {2007///},
	pages = {97 - 108},
	publisher = {Springer},
	organization = {Springer},
	chapter = {8},
	abstract = {In this paper, we propose to explore possible benefits of communication and coordination tools in open source projects using data envelopment analysis (DEA), a general method for efficiency comparisons. DEA offers several advantages: It is a non-parametric optimization method without any need for the user to define any relations between different factors or a production function, can account for economies or diseconwhile omies of scale, and is able to deal with multi-input, multi-output systems in which the factors have different scales. Using a data set of 30 open source project retrieved from SourceForge.net, we demonstrate the application of DEA, showing that the efficiency of the projects is in general relatively high. Regarding the effects of tool employment on the efficiency of projects, the results were surprising: Most of the possible tools, and overall usage, showed a negative relationship to efficiency.
},
	keywords = {metadata, sourceforge},
	issn = {978-0-387-72485-0},
	doi = {http://dx.doi.org/10.1007/978-0-387-72486-7_8},
	attachments = {https://flosshub.org/sites/flosshub.org/files/Exploring\%20the\%20Effects\%20Coodination.pdf},
	author = {Koch, Stefan}
}
