@proceedings {roblesestimating, title = {Estimating Development Effort in Free/Open Source Software Projects by Mining Software Repositories: A Case Study of OpenStack}, year = {2014}, month = {05/2014}, abstract = {Because of the distributed and collaborative nature of free/open source software (FOSS) projects, the development effort invested in a project is usually unknown, even after the software has been released. However, this information is becoming of major interest, especially - but not only- because of the growth in the number of companies for which FOSS has become relevant for their business strategy. In this paper we present a novel approach to estimate effort by considering data from source code management repositories. We apply our model to the OpenStack project, a FOSS project with more than 1,000 authors, in which several tens of companies cooperate. Based on data from its repositories and together with the input from a survey answered by more than 100 developers, we show that the model offers a simple, but sound way of obtaining software development estimations with bounded margins of error.}, keywords = {effort estimation, openstack}, url = {http://gsyc.urjc.es/~grex/repro/2014-msr-effort/msr14-robles-estimating-effort.pdf}, attachments = {https://flosshub.org/sites/flosshub.org/files/msr14-robles-estimating-effort.pdf}, author = {Gregorio Robles and Gonz{\'a}lez-Barahona, Jesus M and Cervig{\'o}n, Carlos and Capiluppi, Andrea} }