Using item response theory to describe the Nonverbal Literacy Assessment (NVLA)

The Nonverbal Literacy Assessment (NVLA) is a literacy assessment designed for students with significant intellectual disabilities. The 218‐item test was initially examined using confirmatory factor analysis. This method showed that the test worked as expected, but the items loaded onto a single factor. This article uses item response theory to investigate the NVLA using Rasch models. First, we reduced the number of items using a unidimensional model, which resulted in high levels of test reliability despite decreasing the number of questions, providing the same information about student abilities in less time. Second, the multidimensional analysis indicated that it is possible to view the NVLA as a test with four dimensions, resulting in more detailed information about student abilities. Finally, we combined these approaches to obtain both specificity and brevity, with a four‐dimensional model using 133 items from the original NVLA.     

The Stability of IRT b Values

This study investigated possible explanations for an observed change in Rasch item parameters (b values) obtained from consecutive administrations of a professional licensure examination. Considered in this investigation were variables related to item position, item type, item content, and elapsed time between administrations of the item. An analysis of covariance methodology was used to assess the relations between these variables and change in item b values, with the elapsed time index serving to control for differences that could be attributed to average or pool changes in b values over time. A series of analysis of covariance models were fitted to the data in an attempt to identify item characteristics that were significantly related to the change in b values after the time elapsed between item administrations had been controlled. The findings indicated that the change in item b values was not related either to item position or to item type. A small, positive relationship between this change and elapsed time indicated that the pool b values were increasing over time. A test of simple effects suggested the presence of greater change for one of the content categories analyzed. These findings are interpreted, and suggestions for future research are provided.     

Students’ views of uncertainty in formal and personal science

Background: Uncertainty is a crucial element of scientific knowledge growth. Students should have some understanding of how science knowledge is developed and why scientific conclusions are considered more or less certain than others. A component of the nature of science, it is considered an important aspect of science education and allows students to recognize the limitations of scientific research.

Purpose: This study examined Grades 5 and 9 students’ views of uncertainty in their personal scientific research and the formal scientific research of professionals.

Sample: This study included 33 students in Grade 5 (n = 17) and Grade 9 (n = 16). The students were recruited from a charter school that emphasised inquiry instruction.

Design and methods: Data were collected through interviews. Students were asked their views of their inquiry-based projects and their views of professional science.

Results: Interview data and statistical analyses indicated that students recognized uncertainty in personal science, which varied across elements of the scientific process. Additionally, their views of uncertainty in formal science tended to change across grades and knowledge of uncertainty in personal and formal science were positively correlated.

Conclusion: These findings offer insights into the processes by which students come to understand uncertainty in science and point to ways of fostering such knowledge through teaching practices.     

Preservice teachers’ articulated noticing through pedagogies of practice

Elementary preservice teachers at six universities engaged in a task that provided them opportunities to articulate their professional noticing within video representations, written decompositions, and animated approximations of practice. The preservice teachers’ written accounts indicated that a majority attended to students or student thinking; however, when asked to illustrate their noticing through animation, focus shifted to the classroom teacher. Findings indicate the extent to which preservice teachers articulated specific mathematics concepts within and across pedagogies of practice and highlight the critical importance for selecting and utilizing multiple types of tasks to better understand preservice teacher noticing. Implications for eliciting and supporting preservice teacher noticing are discussed.     

Appreciated abroad, depreciated at home. The career of a radiochemist in Norway: Ellen Gleditsch (1879-1968)

Ellen Gleditsch (1879-1968) became Norway's first authority on radioactivity and the country's second female full professor. From her many years abroad--in Marie Curie's laboratory in Paris and at Yale University in New Haven with Bertram Boltram--she became internationally acknowledged and developed an extensive personal and scientific network. In the Norwegian scientific community she was, however, less appreciated, and her appointment as a professor in 1929 caused controversy. Despite the recommendation of the expert committee, her predecessor and his allies spread the view that Gleditsch was a diligent but outdated researcher with little scientific promise-a view that apparently persists in the Norwegian chemical community today. In addition to her scientific work, Gleditsch acquired political influence by joining the International Federation of University Women in 1920; she later became the president of both the Norwegian section and the worldwide organization. She worked in particular to establish scholarships enabling women to go abroad.     

Relationships and learning: a review and investigation of narrative coherence in looked‐after children in primary school

This review and investigation draws on principles from attachment theory regarding the importance of early relationships and their impact on the coherence and organisation of psychological functions. Comparisons are made between the narrative coherence scores of an experimental group of 17 looked‐after children with problematic relationship histories in mainstream school and a matched control group of 17 of their peers. There were significant differences between the groups in the coherence of children's narratives, denial and avoidance in story play themes and in their use of intentionality. The paper considers the theory and discusses the results in terms of the implications for teaching, learning and intervention.     

Paraprofessional home visitors’ perspectives on addressing poor mental health,substance abuse,and domestic violence: A qualitative study

This research was conducted to understand paraprofessional home visitors’ perceptions of their training in addressing poor mental health, substance abuse, and domestic violence, and their actions in working with families in addressing these issues. Five focus groups were conducted with a total of 28 paraprofessional home visitors. Three main themes emerged from qualitative analysis. Home visitors experienced tension between addressing families’ more pressing needs such as housing or utilities and addressing poor mental health, substance abuse, and domestic violence. Home visitors felt that they received extensive training in these risk areas, but that this training focused heavily on knowledge acquisition rather than skill development. Home visitors also desired more guidance in addressing families’ poor mental health, substance abuse, and domestic violence concerns—namely, more clarity on the extent to which they should address these issues during visits and more and varied supervision. Home visitors need more training on how to initiate conversations about mental health, substance abuse, and domestic violence, including how to transition conversations from other client needs. Home visiting programs must clarify home visitors’ roles in addressing clients’ poor mental health, substance abuse, and domestic violence and provide additional and varied supervision to home visitors.     

老师(英文)

好的老师能作出解释。出色的老师会表演示范。伟大的老师则知道如何激励学生。——威廉·沃德It’s hard to think about what life would be like without teachers. Who would guide you through