Along with technological advances, the ways of accessing knowledge expand, which causes the information to 14.01.2019 refresh itself in a faster way compared to the past. Naturally, the increase in the refresh rate of the information brings the questioning of the knowledge in terms of accuracy. This awareness has a significant role in scientific Accepted: progress. It is assumed that individuals' need of querying scientific information or the efforts that they spend 01.08.2019 on this issue depend on their epistemological beliefs. From this assumption, this study investigates the role of the epistemological beliefs in predicting middle-school students' research-inquiry self-efficacy perception. The Online First: study, which has been designed as a relational screening model, was conducted using a purposive sampling 21.08.2019 method, with 2857 middle-school students, who were studying at two public middle-schools in Ankara. "Epistemological Belief Questionnaire" and "Self-Efficacy Perception for Research-Inquiry Scale" were used for Published: data collection. Pearson correlation and multiple regression analysis were employed in the analysis of the data. 31.01.2021 As a result of multiple regression analysis, it was found that among self-efficacy perceptions, the score of avoidance, personal development and continuing to research predicted some epistemological beliefs significantly, namely the development of knowledge and the source of knowledge.