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Background: The use of Grey Literature (GL) has been investigate in diverseresearch areas. In Software Engineering (SE), this topic has an increasinginterest over the last years. Problem: Even with the increase of GL publishedin diverse sources, the understanding of their use on the SE research communityis still controversial. Objective: To understand how Brazilian SE researchersuse GL, we aimed to become aware of the criteria to assess the credibility oftheir use, as well as the benefits and challenges. Method: We surveyed 76active SE researchers participants of a flagship SE conference in Brazil, usinga questionnaire with 11 questions to share their views on the use of GL in thecontext of SE research. We followed a qualitative approach to analyze openquestions. Results: We found that most surveyed researchers use GL mainly tounderstand new topics. Our work identified new findings, including: 1) GLsources used by SE researchers (e.g., blogs, community website); 2) motivationsto use (e.g., to understand problems and to complement research findings) orreasons to avoid GL (e.g., lack of reliability, lack of scientific value); 3)the benefit that is easy to access and read GL and the challenge of GL to haveits scientific value recognized; and 4) criteria to assess GL credibility,showing the importance of the content owner to be renowned (e.g., renownedauthor and institutions). Conclusions: Our findings contribute to form a bodyof knowledge on the use of GL by SE researchers, by discussing novel (somecontradictory) results and providing a set of lessons learned to both SEresearchers and practitioners.

On the Use of Grey Literature: A Survey with the Brazilian Software Engineering Research Community