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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.

Recently scholars have advocated for using teachers' practice as a site for teacher learning. The recent proliferation of online, digital spaces, including simulated classrooms, has paved the way for novel approaches within practice-based teacher education. Yet, limited research has investigated the extent to which and how the use of online, simulated teaching experiences promote teacher learning of core teaching practices. The purpose of this study was to examine whether and how integrating simulated teaching experiences into teacher education coursework impacts preservice teacher (PST) learning. Findings showed that the use of simulated teaching experiences within elementary teacher education methods courses resulted in evidence of statistically significant growth in PSTs' ability to engage in one core teaching practice: facilitating argumentation-focused discussions.

Facilitating discussions is a key approach that science teachers use to engage students in scientific argumentation. However, learning how to facilitate argumentation-focused discussions is an ambitious teaching practice that can be difficult to learn how to do well, especially for preservice teachers (PSTs) who typically have limited opportunities to tryout and refine this teaching practice. This study examines secondary PSTs' perceptions and engagement with a science performance task--used within an online, simulated classroom consisting of five middle school student avatars--to practice this ambitious teaching practice. Findings showed that the PSTs had a strong understanding of the discussion's primary goal and perceived the task components to be easy to understand, useful in helping them prepare for the simulated discussion, and an authentic representation of what middle school students would say and do. In addition, while the PSTs attended to similar content and pedagogical features within their facilitated discussion, they varied in their ability to successfully facilitate the discussion. This study adds to the growing literature on innovative, technology-based solutions for supporting teacher learning and points to one productive approach that can be incorporated within science teacher education as an approximation of practice of this ambitious teaching practice.

Preservice elementary teachers (PSTs) prepare for various standardized assessments, such as the Praxis® licensure assessment. However, there is little research on test-taking behavior and test-taking strategies for this examinee population. A common belief and instruction given in some test preparation materials is that examinees should stick to their initial answer choice. Decades of research has debunked this belief, finding that generally examinees benefit from answer changing behavior. However, there is minimal research on answer changing behavior among PSTs. Moreover, there is little research examining answer changing behavior for tests assessing constructs that integrate content and practice, or across different technology-enhanced item types. We use an online Content Knowledge for Teaching (CKT) assessment that measures PSTs' CKT in one science area: matter and its interactions. In this study, we analyzed process data from administering the online CKT matter assessment to 822 PSTs from across the US to better understand PSTs' behaviors and interactions on this computer-based science assessment. Consistent with prior research findings, this study showed that examinees who changed their responses benefited more often than were harmed by doing so with higher-performing examinees benefiting more than lower-performing examinees, on average. These findings also were consistent across item types. Implications for computer-based CKT science assessment design and delivery are discussed.

Engaging students in scientific argumentation is a hallmark of high-quality science instruction. Despite the importance of this practice, it is not a ubiquitous one within K-12 classrooms since scientific argumentation is complex and difficult to learn how to do well. In this study, we examined similarities and differences in how preservice teachers (PSTs) and in-service teachers (ISTs) facilitate an argumentation-focused discussion with five upper elementary student avatars in an online, simulated classroom. Developing a better understanding of how science teachers at different stages of their career foster scientific argumentation will support teacher educators and researchers in designing more directed interventions to scaffold teacher learning of this complex practice. Findings showed that most teachers provided opportunities for students to engage in both argument construction and critique during these discussions. In addition, both PSTs and ISTs frequently prompted students to reference data or observations to engage in argument construction and were most likely to prompt students to agree or disagree and explain the reason for their agreement or disagreement to engage in argument critique. Finally, findings showed that ISTs used a wider variety of talk moves and used them more frequently in an integrated fashion throughout the discussions to engage the students in scientific argumentation. Implications for studying and promoting teacher learning of this complex teaching practice and for integrating simulated classrooms as practice-based tools in science teacher education and professional development settings are discussed.

The purpose of this report is to examine the performance of assessment items designed to measure elementary teachers' content knowledge for teaching (CKT) science as part of the ETS® Educator Series. The Elementary Education: CKT Science assessment is 1 component of licensure examination through the PRAXIS® assessments. The Elementary Education: CKT Science assessment is designed to determine whether kindergarten through 6th-grade elementary teacher candidates have the essential content knowledge needed for teaching elementary science as new teachers at the entry level. This report provides information about the development of the Elementary Education: CKT Science framework and the associated assessment items. The main part of the report focuses on the evidence gathered when piloting 104 CKT science assessment items with 417 preservice and novice elementary teachers. This evidence included the following: (a) how these new CKT science assessment items function, including their item difficulties and discrimination, and reliabilities of the pilot forms and of the classification of examinees; (b) how teachers perceive the importance and relevance of these new assessment items; (c) how teachers' performances on these items relate to their background characteristics and professional and academic preparation; and (d) how teachers' performances on the CKT science items compare to their performances on an assessment designed to measure only their science subject matter knowledge.

Developing knowledge about science instruction is critical for preservice teachers. This study explores how 79 elementary preservice teachers perceive the relevance and importance of assessment task scenarios designed to elicit information about content knowledge for teaching (CKT) about matter and its interactions--a foundational topic for teaching physical science. Participants completed practice-based assessment tasks that described teaching scenarios about elementary science teaching and that addressed five matter topics: properties of matter, changes in matter, the model of matter, materials, and conservation of matter. We aimed to explore how relevant preservice teachers felt these task scenarios were to their teaching experience and how important knowing how to answer these tasks was for the work of elementary teachers. Findings suggest that preservice teachers tended to recognize the centrality of these task scenarios for the work typically done in elementary classrooms, even if they do not report having firsthand experience with the content and practices represented in the scenarios. Moreover, participants tended to provide a general rationale about why these scenarios were important for the work of teaching science, but a limited number of responses made explicit connections between a task scenario and the specific instructional practice related to elementary teachers' work. This study poses implications for the use of CKT tasks in elementary education programs.

In this report of an action research study, the authors describe how one elementary science teacher educator used transcript coding of simulated classroom discussions as a pedagogical approach to learn about her elementary preservice teachers' (PSTs') abilities to notice key aspects of scientific argumentation discussions. Elementary PSTs (n = 19) enrolled in a science methods course engaged in transcript coding before and after facilitating their own argumentation discussions in the Mursion® simulated classroom environment with five upper-elementary student avatars. The first transcript was from a PST outside of the course; the second was from PSTs' own discussions. The study examined how PSTs' coding of the transcripts could provide the teacher educator with insights regarding PSTs' noticing about engaging students in argument construction and critique. The study also aimed to investigate PSTs' perspectives on the utility of transcript coding. Findings showed that PSTs can code with accuracy, yet they may be more apt to miss coding teacher prompts that encourage students to share reasoning. Results also revealed that PSTs sometimes coded nonexamples of argument construction and critique, suggesting a need for more targeted learning experiences to connect teaching principles with classroom interactions, and the PSTs perceived coding their own and other's transcripts as uniquely valuable learning experiences.

This report describes efforts by a group of science teachers, teacher educators, researchers, and content specialists to conceptualize, develop, and pilot practice-based assessment items designed to measure elementary science teachers' content knowledge for teaching (CKT). The report documents the framework used to specify the content-specific teaching practices and instructional tools that are critical to the work that elementary science teachers engage in with students, curriculum, and instruction. Drawing on this framework, the report details the development process for practice-based assessment items designed to measure CKT elementary science in three content areas: (a) structure and properties of matter, (b) ecosystems, and (c) Earth's place in the universe. These practice-based assessment items address the various content challenges elementary science teachers face in their work and were designed to be used as a foundation for building large-scale assessments of elementary science teachers' CKT science. This report presents initial validity evidence examining the practice-based CKT science item characteristics using results from online administrations of these items to 250 upper elementary science teachers. Findings reveal that the majority of these new assessment items capture variability in elementary science teachers' performance and that a large proportion of the items differentiate moderately well, supporting a beginning proof-of-concept for the conceptualization and design of these practice-based CKT elementary science assessment items.

The purpose of this research study was to examine in-service teachers' perceptions about, attention to, and use of two different types of written formative feedback designed to support them in developing their ability to engage in one core teaching practice: facilitating discussions that engage students in scientific argumentation. This core teaching practice has been nominated as important for building students' scientific literacy and has been perennially difficult for teachers to learn how to engage in successfully. This study used an online, simulated classroom made up of five upper elementary student avatars as the practice-based space where the participating in-service teachers facilitated two science discussions. Following the first discussion, each teacher received one of two types of written formative feedback (namely, specific feedback or scoring level feedback) based on their discussion. Findings indicated that the teachers perceived both types of feedback as useful and strongly attended to areas of improvement suggested in the written feedback, regardless of feedback condition. Study results suggest that the use of specific or scoring level feedback can serve as one valuable mechanism to support improvement when using online simulations with elementary science teachers.

Purpose: This paper aims to examine three distinct aspects of authenticity that pre-service teachers (PSTs) experience when they engage with virtual classroom environments to develop their content-intensive instructional practice -- task authenticity, student avatar authenticity and performance authenticity -- and their perceptions about the usefulness of the simulated teaching experience to support their learning. Design/methodology/approach: This paper explored these conceptions of authenticity and usefulness within a larger research study whose goal was to develop virtual environment tools to help elementary PSTs learn how to engage in one ambitious teaching practice: facilitating discussions that engage students in argumentation. To examine these aspects of authenticity and usefulness, this paper used a general qualitative deductive analysis approach to examine data from 104 interviews with 26 case study teachers and examined patterns in PSTs' perceptions within and across interviews and authenticity aspects. Findings: While these PSTs strongly value the utility of these tools to support their learning, findings point to variation in their perceptions of authenticity. Findings showed that most PSTs perceived the tasks as an authentic representation of the work of teaching. However, their perceptions of task authenticity did not always align with their perceptions of avatar or performance authenticity. Originality/value: This paper argues that these three aspects of authenticity relate to, but expand upon, the broader notions of presence and plausibility noted in the literature on virtual environments and should be taken up more directly in future studies of users' perceptions of virtual environments both within and outside of educational contexts.

Human-in-the-loop simulation is a valuable tool that can support novice teachers in learning how to lead classroom discussions. We ground our use of simulation in a theory of practice-based teacher education, examining how authenticity is theorized around approximations of practice. We then illustrate the use an approximation of practice approach, discussing guiding principles of project work in which novice teachers learn to facilitate small-group discussions with digitally simulated fifth-grade students. Several provocative vignettes illustrate the complexity of authenticity, suggesting additional theorization to help us authenticity as more a malleable attribute than as simulation's end goal. One implication is that more study is needed, in the context of using virtual environments and humans in teacher education, addressing authenticity, participant perception of authenticity, and their interaction.

To support science teachers in learning how to engage in ambitious teaching practices, teacher educators, professional development facilitators, and researchers need to develop a nuanced understanding of the pedagogical content knowledge (PCK) that science teachers access and use in their daily work. Despite the consensus on the importance of science teachers' topic-specific professional knowledge, the nature of this knowledge remains largely underspecified in teacher education, which makes it difficult to pinpoint how to effectively develop their PCK and limits the development of assessment tools to measure science teachers' PCK. The purpose of this study was to articulate and organize the topic-specific PCK that science teachers draw upon when teaching about one high-leverage content area within matter and its interactions: phase change. In this study, we focused on two components of teachers' personal PCK that have been shown in the literature to be critical to the work of teaching elementary science when they: (1) elicit and interpret students' ideas; and (2) select, critique, and generate instructional strategies. Findings from this study show how elementary science teachers' personal PCK in one content area can vary across PCK components (student ideas and instructional strategies), which further underscores the importance of understanding and assessing the topic-specific nature of this knowledge. Implications and considerations for developing elementary science teachers' personal PCK and for measuring their PCK across content topics, grade levels, and teaching contexts are discussed.

In order to deepen students' understanding of natural phenomenon and how scientific knowledge is constructed, it is critical that science teachers learn how to engage students in productive scientific argumentation. Simulations for teachers are one possible solution to providing practice-based spaces where novices can approximate the work of facilitating argumentation-focused science discussions. This study's purpose is to examine how preservice elementary teachers (PSETs) engage in this ambitious teaching practice within an online simulated classroom composed of five upper elementary student avatars. In this study, which is part of a larger research project, we developed and used four performance tasks to provide opportunities for PSETs to practice facilitating argumentation-focused science discussions within a simulated classroom. The student avatars were controlled on the backend by a human-in-the-loop who was trained to respond to the teachers' prompts in real time using predesigned student thinking profiles and specific technology, such as voice modulation software. We used analysis of transcripts from the PSETs' video-recorded discussions to examine how the PSETs engaged the student avatars in scientific argumentation, with particular attention to the teaching moves that supported argument construction and argument critique. We also used survey and interview data to examine how the PSETs viewed the usefulness of these simulation-based tools to support their learning. Findings show that there was variability in the extent to which the PSETs engaged the student avatars in argument construction and argument critique and the teaching moves that the PSETs used to do so. Results also indicated that PSETs strongly perceive the value of using such tools within teacher education. Implications for the potential of simulations to provide insights into novices' ability to engage students in scientific argumentation and to support them in learning in and from their practice, including how to productively integrate these tools in teacher education, are discussed.

There is strong agreement in science teacher education of the importance of teachers' content knowledge for teaching (CKT), which includes their subject matter knowledge and their pedagogical content knowledge. However, there are limited instruments that can be easily administered and scored on a large scale to assess and study elementary science teachers' CKT. Such measures would support strategic monitoring of large groups of science teachers' CKT and the investigation of comparative questions about science teachers' CKT longitudinally across the professional continuum or across teacher education or professional development sites. To address this gap, this study focused on designing an automatically scorable summative assessment that can be used to measure preservice elementary teachers' (PSETs') CKT in one high‐leverage science content area: matter and its interactions. We conducted a field test of this CKT instrument with 822 PSETs from across the United States and used the response data to examine how this instrument functions as a potential tool for measuring PSETs' CKT in this science content area. Results suggest this instrument is reliable and can be used on large scale to support valid inferences about PSETs' CKT in this content area. In addition, the dimensionality analysis showed that all items measure a single construct of CKT about matter and its interactions, as participants did not show any differential performance by content topic or work of teaching science instructional tool categories. Implications for progressing the field's understanding of the nature of CKT and approaches to developing summative instruments to assess science teachers' CKT are discussed. [ABSTRACT FROM AUTHOR]

To evaluate the recent advances in learning progression (LP) research and identify future research directions, we reviewed LP literature from 2006 to 2018. Through a systematic search of Web of Science databases and key journals, we located 130 LP articles published between 2006 and 2018. Among these articles, we reviewed 86 studies. The review was framed around three types of coherence that LPs can provide in a system of curriculum, instruction, and assessment: developmental, vertical, and horizontal coherence. Developmental coherence refers to the idea that LPs, as cognitive models, should describe development in students from intuitive thinking to scientific thinking. It provides a foundation for building the horizontal coherence (the alignment among curriculum, instruction, and assessment) and the vertical coherence (the linkage between classroom and large-scale assessments). The results of our review suggest significant advances in enhancing the developmental coherence. More specifically, existing LPs have captured the mechanisms of knowledge development and integrated knowledge and practice in different ways. Regarding the horizontal coherence, while the methodology for the development and validation of LPs has been established, limited attention has been given to LP-based interventions and teachers' understanding and use of LPs. Only one study explored LP's role in building vertical coherence. The review reveals a great need for future research (a) to develop LPs for scientific reasoning that cut across multiple science topics and disciplines, (b) to use LPs in instructional interventions, teacher education, and professional development, and (c) to use LPs to link classroom assessments with large-scale assessments.

Despite the prevalent use of observational measures in teacher evaluation systems, research has only recently begun to take into account how aspects of the instructional environment and lesson sampling design may interact with teachers' scores on these measures. Instead, one assumption guiding current evaluation systems is that the variation in teachers' instructional practices captured by the lessons sampled is a valid measure of their teaching quality. Our study investigates this assumption by examining whether scores from observational measures of science teachers' instructional practices vary depending on lesson type. Results show that science teachers' scores on certain observational measures vary across lab and nonlab lessons, suggesting that the claims one can make about science teaching effectiveness are dependent on the particular types of lessons observed. Given the increasing prominence and use of observational measures within evaluation systems, it is imperative to ensure that the observed lessons adequately represent variation in a teacher's practice and are not subject to undue instability from the types of lessons included in the sample, especially in science where there are clear distinctions in the instructional practices teachers employ across lab and nonlab lessons. Implications for measuring science teaching quality are discussed.

The demand for assessments of competencies that require complex human interaction is steadily growing as we move toward a focus on twenty-first century skills. As assessment designers aim to address this demand, we argue for the importance of a common language to understand and attend to the key challenges implicated in designing task situations to assess such competencies. We offer the descriptors "coordinated," "accumulated," and "dynamic" (CAD) as a way of understanding the nature of these competencies and the considerations involved in measuring them. We use an example performance task designed to measure teacher competency in leading an argumentation-focused discussion in elementary science to illustrate what we mean by the coordinated, accumulated, and dynamic nature of this construct and the challenges assessment designers face when developing performance tasks to measure this construct. Our work is unique in that we designed these performance tasks to be deployed within a digital simulated classroom environment that includes simulated students controlled by a human agent, known as the simulation specialist. We illustrate what we mean by these three descriptors and discuss how we addressed various considerations in our task design to assess elementary science teachers' ability to facilitate argumentation-focused discussions.

Engaging children in argumentation‐focused discussions is essential to helping them collaboratively make sense of scientific phenomena. To support this effort, teachers must listen and be responsive to students' ideas to move the discussion forward with the goal of reaching consensus. Given the complexity of this ambitious science teaching practice, in lieu of traditional field experiences, online simulated teaching experiences provide opportunities for preservice teachers to practice implementing these strategies in a low‐risk, high‐support environment. Limited research has explored elementary preservice teachers' responsiveness while navigating an argumentation‐focused discussion, particularly in an online simulated teaching experience. The purpose of this study was to examine preservice teachers' responsiveness to students' ideas while eliciting students' initial constructed arguments and encouraging argument critique in two online simulated teaching experiences. Findings showed that preservice teachers' responsiveness to students' ideas was high in both online simulated teaching experiences when asking students to share evidence as well as engage in critique. However, their responsiveness varied when prompting for reasoning and was often low when eliciting students' claims. These findings provide empirical evidence that such online simulated teaching experiences can be used as productive spaces for PSTs to practice being responsive to students' ideas during argumentation‐focused discussions. [ABSTRACT FROM AUTHOR]

This article reports outcomes from a working conference focused on the role of simulations in K-12 mathematics and science teacher education. The authors synthesized work shared via conference papers and presentations organized around three questions: (a) How are simulations defined and used? (b) How do simulations work? and (c) What evidence is being collected and what evidence should be collected about the use of simulations to prepare K-12 mathematics and science teachers? Results suggested that, while simulations vary in terms of format and foci, one common element is that they serve as responsive and interactive learning spaces where preservice and in-service teachers can rehearse critical instructional practices essential to the work of teaching in these disciplines. Attendees noted the importance of learning cycles to achieve the full benefit of these simulations to promote teachers' learning and advocated for using experimental and quasi-experimental designs to better understand for whom, under what conditions, and for what purposes simulations are best used to prepare K-12 mathematics and science teachers. Connections to and implications for ongoing work within mathematics and science practice-based teacher education are discussed.

In order to create conditions for students' meaningful and rigorous intellectual engagement in science classrooms, it is critically important to help science teachers learn which strategies and approaches can be used best to develop students' scientific literacy. Better understanding how science teachers' instructional practices relate to student achievement can provide teachers with beneficial information about how to best engage their students in meaningful science learning. To address this need, this study examined the instructional practices that 99 secondary biology teachers used in their classrooms and employed regression to determine which instructional practices are predictive of students' science achievement. Results revealed that the secondary science teachers who had well-managed classroom environments and who provided opportunities for their students to engage in student-directed investigation-related experiences were more likely to have increased student outcomes, as determined by teachers' value-added measures. These findings suggest that attending to both generic and subject-specific aspects of science teachers' instructional practice is important for understanding the underlying mechanisms that result in more effective science instruction in secondary classrooms. Implications about the use of these observational measures within teacher evaluation systems are discussed.

Recently scholars have advocated for using teachers' practice as a site for teacher learning. The recent proliferation of online, digital spaces, including simulated classrooms, has paved the way for novel approaches within practice-based teacher education. Yet, limited research has investigated the extent to which and how the use of online, simulated teaching experiences promote teacher learning of core teaching practices. The purpose of this study was to examine whether and how integrating simulated teaching experiences into teacher education coursework impacts preservice teacher (PST) learning. Findings showed that the use of simulated teaching experiences within elementary teacher education methods courses resulted in evidence of statistically significant growth in PSTs' ability to engage in one core teaching practice: facilitating argumentation-focused discussions. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

Teacher quality is at the center of today's ardent discussions about the educational system, with calls for the reform and critical review of teacher development programs. There is no lack of activity in response to these calls. There are thousands of teacher education, induction, and professional programs in the U.S. which offer teachers a veritable carnival of options. But these options exist in a (non)system with little coherence or control. In this article, the authors outline the dimensions of the variability of teacher learning opportunities currently available, the unintended consequences of that variability, and the challenges faced by educators as we attempt to reform the system, respond to our critics, and offer teachers coherent learning experiences that lead to high quality teaching. (Contains 3 notes.)

The elementary science teacher educators in this article set recognize the challenges that new science teachers face when they enter classrooms. They have developed frameworks and strategies aimed at helping the preservice teachers with whom they work become "well-started beginners" who are ready to address problems of science teaching. To do so, these educators purposefully engage the candidates in focused dialogue regarding challenges or problems of practice that they will likely face in their work. These challenges include (1) engaging in science, (2) organizing instruction, and (3) understanding students. The science teacher educators use a dialogic third space to help the preservice teachers reconsider and develop deeper understandings of these problems of practice. In this introduction, we point out some of the common themes that tie these articles together, including (a) a focus on problems of practice in elementary science teaching, (b) a focus on dialogue with preservice teachers about these problems of practice, (c) a commitment to developing tools and approaches that support principled reasoning about these problems of practice, and (d) a commitment to shared goals and methods for research on elementary science teacher education. We point to ways that these themes are addressed in the three articles.

Engaging students in scientific argumentation is a hallmark of high‐quality science instruction. Despite the importance of this practice, it is not a ubiquitous one within K‐12 classrooms since scientific argumentation is complex and difficult to learn how to do well. In this study, we examined similarities and differences in how preservice teachers (PSTs) and in‐service teachers (ISTs) facilitate an argumentation‐focused discussion with five upper elementary student avatars in an online, simulated classroom. Developing a better understanding of how science teachers at different stages of their career foster scientific argumentation will support teacher educators and researchers in designing more directed interventions to scaffold teacher learning of this complex practice. Findings showed that most teachers provided opportunities for students to engage in both argument construction and critique during these discussions. In addition, both PSTs and ISTs frequently prompted students to reference data or observations to engage in argument construction and were most likely to prompt students to agree or disagree and explain the reason for their agreement or disagreement to engage in argument critique. Finally, findings showed that ISTs used a wider variety of talk moves and used them more frequently in an integrated fashion throughout the discussions to engage the students in scientific argumentation. Implications for studying and promoting teacher learning of this complex teaching practice and for integrating simulated classrooms as practice‐based tools in science teacher education and professional development settings are discussed. [ABSTRACT FROM AUTHOR]

Teacher quality is at the center of today's ardent discussions about the educational system, with calls for the reform and critical review of teacher development programs. There is no lack of activity in response to these calls. There are thousands of teacher education, induction, and professional programs in the U.S. which offer teachers a veritable carnival of options. But these options exist in a (non)system with little coherence or control. In this article, the authors outline the dimensions of the variability of teacher learning opportunities currently available, the unintended consequences of that variability, and the challenges faced by educators as we attempt to reform the system, respond to our critics, and offer teachers coherent learning experiences that lead to high quality teaching. Keywords teacher education, teacher quality, professional development, Offering a high-quality education to all U.S. students and building an educational system that supports teachers are topics of much concern and investment, passion and critique. Teacher quality is at [...]

To support science teachers in learning how to engage in ambitious teaching practices, teacher educators, professional development facilitators, and researchers need to develop a nuanced understanding of the pedagogical content knowledge (PCK) that science teachers access and use in their daily work. Despite the consensus on the importance of science teachers' topic-specific professional knowledge, the nature of this knowledge remains largely underspecified in teacher education, which makes it difficult to pinpoint how to effectively develop their PCK and limits the development of assessment tools to measure science teachers' PCK. The purpose of this study was to articulate and organize the topic-specific PCK that science teachers draw upon when teaching about one high-leverage content area within matter and its interactions: phase change. In this study, we focused on two components of teachers' personal PCK that have been shown in the literature to be critical to the work of teaching elementary science when they: (1) elicit and interpret students' ideas and (2) select, critique, and generate instructional strategies. Findings from this study show how elementary science teachers' personal PCK in one content area can vary across PCK components (student ideas and instructional strategies), which further underscores the importance of understanding and assessing the topic-specific nature of this knowledge. Implications and considerations for developing elementary science teachers' personal PCK and for measuring their PCK across content topics, grade levels, and teaching contexts are discussed. [ABSTRACT FROM AUTHOR]