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Message from the Chairs

Brazil Software Crowdsourcing: A First Step in a Multi-year Study
Rafael Prikladnicki, Leticia Machado, Erran Carmel, and Cleidson R. B. de Souza
(PUCRS, Brazil; American University, USA; Vale Institute of Technology, Brazil; Federal University of Pará, Brazil)

Method-Call Recommendations from Implicit Developer Feedback
Sven Amann, Sebastian Proksch, and Mira Mezini
(TU Darmstadt, Germany)

Researching Crowdsourcing Software Development: Perspectives and Concerns
Klaas-Jan Stol and Brian Fitzgerald
(Lero, Ireland; University of Limerick, Ireland)

An Exploratory Study of Contribution Barriers Experienced by Newcomers to Open Source Software Projects
Christoph Hannebauer, Matthias Book, and Volker Gruhn
(University of Duisburg-Essen, Germany)

Utilization of Synergetic Human-Machine Clouds: A Big Data Cleaning Case
Deniz Iren, Gokhan Kul, and Semih Bilgen
(Middle East Technical University, Turkey)