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The purpose of this study was to examine teachers’ competency in teaching for student competence in science. Drawing on literature on competence and science teacher education, we identified 44 indicators of science teaching competence in relation to the current Korean National Science Curriculum, from which 54 items for teachers’ self-assessment were developed and validated. Through online administration of the self-assessment instrument, responses from 210 primary and secondary teachers were collected. Factor analysis resulted in nine factors across three competence areas. Teacher competence differed across factors. One-way ANOVA analysis revealed that primary teachers indicated significantly higher competence in most aspects of teaching than secondary teachers and that years of teaching was related to professional development methods utilized by teachers. Suggestions for professional development program design and further research topics were discussed.

This study investigated the modalities of science teaching practice and students' pedagogic subject positioning through the linguistic features of science classroom discourse and the discursive interaction. For this purpose, this study sought to develop a methodology for classroom discourse analysis, the TMARC (Triangular Model of Analyzing discourse Register and language Code). Applied to a middle school science classroom, the TMARC revealed that there were six types of teaching modalities during the classroom practices in spite of the teacher's predominant didactic teaching and that there existed the diverse variation types of the teaching modalities according to a temporal order. In addition, we found four types of pedagogic subject positioning through the application of TMARC. We also argued that the pedagogic subject positioning of a successful science learner was implemented in the discourse language codes of personal collaborative open discourse, positional collaborated open discourse, and personal collaborative controlled discourse. Each of these related to the science teaching modality in which student centeredness was emphasized. Thus, this study suggests that a science teacher's competency related to managing classroom discourse can control students' pedagogic subject position and, by extension, contribute to students' science learning.

This study sought to investigate learning progressions for astronomical systems which synthesized the motion and structure of Earth, Earth-Moon system, solar system, and the universe. For this purpose we developed ordered multiple-choice items, applied them to elementary and middle school students, and provided validity evidence based on the consequence of assessment for interpretation of learning progressions. The study was conducted according to construct modeling approach. The results showed that the OMCs were appropriate for investigating learning progressions on astronomical systems, i.e., based on item fit analysis, students' responses to items were consistent with the measurement of Rasch model. Wright map analysis also represented that the assessment items were very effective in examining students' hypothetical pathways of development of understanding astronomical systems. At the lower anchor of the learning progression, while students perceived the change of location and direction of celestial bodies with only two-dimensional earth-based view, they failed to connect the locations of celestial bodies with Earth-Moon system model, and they could recognized simple patterns of planets in the solar system and milky way. At the intermediate levels, students interpreted celestial motion using the model of Earth rotation and revolution, Earth-Moon system, and solar system with space-based view, and they could also relate the elements of astronomical structures with the models. At the upper anchor, students showed the perspective change between space-based view and earth-based view, and applied it to celestial motion of astronomical systems, and they understood the correlation among sub-elements of astronomical systems and applied it to the system model.