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With the growing use of mixed reality teaching simulations in teacher education there is a need for researchers to examine how preservice teacher (PST) learning can be supported when using these simulations. To address this gap the current study explores how 47 PSTs used an online teaching simulation to facilitate a discussion focused on argumentation with five student avatars in the MursionTM mixed reality simulated classroom environment. We assessed PSTs' performance in the simulation using rubric-level scores assigned by trained raters and then compared the scores to PSTs' survey responses completed after their discussion asking them to self-report their goals for the discussion, how successful they thought they were across five dimensions of facilitating high-quality, argumentation-focused discussions, and their overall perceptions of the mixed reality teaching simulation. Findings suggest that PSTs' understanding of the discussion task's learning goals somewhat predicted their success in facilitating the discussion and that PSTs' self-assessment of their performance was not always consistent with raters' evaluation of the PSTs' performance. In particular, self-assessment was found to be most consistent with raters' evaluations for those PSTs with higher rater-assigned scores and least consistent for those with lower rater-assigned scores. The implications of these findings are as follows: (1) researchers should be cautious in relying on PST self-report of success when engaging in mixed reality teaching simulations, particularly because low performance may be obscured, (2) teacher educators should be aware that reliance on self-report from PSTs likely obscures the need for additional support for exactly those PSTs who need it most, and (3) the field, therefore, should expand efforts to measure PSTs' performance when using mixed reality teaching simulations. 

Preservice teachers (PSTs) need to be able to use ambitious teaching practices to help support their students’ productive engagement in scientific practices such as analyzing and interpreting data or using evidence-based reasoning to support their claims. Approximations of practice are one way in which teacher educators can support their PSTs to develop their skills in enacting ambitious teaching practices. In this study, we report on the use of a suite of three online, simulated approximations of practice where secondary PSTs practiced facilitating discussions focused on engaging students in argumentation. Using information from both PSTs’ and teacher educators’ perspectives, we examined their main takeaways from each simulation experience, how learning from one simulation was used to prepare for the next simulation, PSTs’ perception of the simulations’ authenticity, and their views about whether they would recommend using this online suite of simulations in future teacher preparation courses. Findings suggested that teacher educators and PSTs alike noted a variety of main takeaways, including understanding the importance of planning and asking good questions. Furthermore, they recommended the suite for use in future teacher education courses. Implications of the work for productively integrating online simulations into teacher education settings are discussed. 

Providing opportunities for students to talk directly with their peers is a critical dimension to facilitating discussions in mathematics and science, including argumentation‐focused discussions in which students construct arguments and critique others' arguments. Research suggests that supporting student‐to‐student talk and facilitating argumentation discussions are complex and challenging practices for preservice teachers (PSTs). Elementary PSTs from two mathematics and two science methods courses practiced facilitating student‐to‐student talk within the context of an argumentation‐focused discussion. This study's main purpose was to explore the prompts that 29 PSTs used to encourage student‐to‐student talk in a simulated classroom. Findings show the PSTs were able to use direct prompts that encourage student‐to‐student talk but were just as likely to use prompts that may discourage students from talking to each other. Most direct prompts PSTs used to encourage student‐to‐student talk were for the purpose of argumentation construction and/or critique. PSTs were more likely to use indirect prompts, much like Talk Moves, that encourage students to consider others' ideas rather than requesting that students talk with each other. These findings have important implications for future research, as well as for teacher educators and professional learning facilitators who support teachers learning to encourage student‐to‐student talk during argumentation‐focused discussions. 

Research on teacher educators’ professional learning has gained increasing interest within science education. Curriculum materials have been suggested as a means of supporting teacher learning for several decades but have not yet been examined as a potential tool for supporting the learning of teacher educators. In this paper, we conceptualize a set of design heuristics to guide the development of educative curriculum materials for teacher educators. We illustrate how these heuristics guided the identification of specific educative features, which we included when developing prototype educative curriculum materials for elementary science teacher educators in content and/or method courses to support the development of preservice teachers’ content knowledge for teaching about matter and its interactions. 

Abstract Despite the importance of developing elementary science teachers' content knowledge for teaching (CKT), there are limited assessments that have been designed to measure the full breadth of their CKT at scale. Our overall research project addressed this gap by developing an online assessment to measure elementary preservice teachers' CKT about matter and its interactions. This study, which was part of our larger project, reports on findings from one component of the item development process examining the construct validity of 118 different CKT about matter assessment items. In this study, 86 elementary teachers participated in cognitive interviews to examine: (a) the knowledge and reasoning they used when responding to these CKT about matter assessment items and (b) the nature of the content challenges and the content teaching challenges they encountered. Findings showed that over 80% of participant interview responses indicated that the CKT about matter items functioned as hypothesized, providing evidence to support future use of these items on a large‐scale assessment and in studies of science teachers' CKT. When responding to the items, participants showed evidence of four main challenges with the science content: (a) using scientific concepts to reason about science tasks, (b) using adequate evidence to reason about science phenomenon, (c) drawing upon examples of scientific phenomena, and (d) drawing upon science vocabulary. Findings also showed that participants experienced challenges regarding the following content teaching aspects when responding to these items: (a) connecting to key scientific concepts involved in the work of teaching science, (b) attending to instructional goal(s), and (c) recognizing features of grade‐level appropriateness. Implications for using CKT items as part of large‐scale science assessment systems and identifying areas to target in elementary science teachers' CKT development are addressed.