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Science teachers play a key role in successfully implementing science education reforms and providing all students with meaningful science learning opportunities. Therefore, what core teaching competencies do science teachers need to have in their practice? This study uses fuzzy Delphi technique and Analytic Hierarchy Process to approach the above problems. Experts from Chinese universities, secondary schools and educational research institutions were invited to participate in two rounds of Delphi process. The research results show that the four domains of core teaching competencies of science teachers and their 21 competencies have high content validity. Additionally, it can be concluded that the weights of core competencies of making learning objectives, raising pedagogical questions, stimulating learning motivation and analyzing course content ranked high, while the weights of core competencies of using information technology and multimedia, evaluating practical work, and presenting research results have received less attention. It is believed that the results of this study can enlighten the education reform of science teachers and promote the professional development of pre-service/in-service science teachers. Keywords: teaching competence, science teacher, fuzzy Delphi, Analytic Hierarchy Process

This study aims to reveal the trends and foundations in research on students’ conceptual understanding in science education. The literature was selected from three recognized journals in science education. The Structural Topic Model (STM) method was used to categorize articles into ten topics considering information about the semantic cohesion and exclusivity of words to topics. The topic, which has attracted increasing research interest, was selected using a method similar to standard regression analysis, and its changing focus was identified through an analysis of its research contents. Foundations of research about students’ conceptual understanding between 1980–1999 and 2000–2019 were obtained through a review of their top 10 most-cited papers. Three conclusions were drawn: a) there were ten sub-topics of research about students’ conceptual understanding; b) the research on the development (or pathways) of students’ scientific argumentation/reasoning is likely to attract further interest in the future; and c) compared to the studies in the first period, the studies in the second stage favor research on the description (nature, mental process, etc.) of the process of students’ conceptual understanding as the research foundation. Keywords: conceptual understanding, journal publication, structural topic model, text mining.

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