Towards standardization of language for teaching in the Andean countries

Former Director of the National Institute of Linguistics and the National Institute of Anthropology. Author of numerous books, textbooks and articles on linguistics and the Quechua language.     

Developing and validating a competence framework for secondary mathematics student teachers through a Delphi method

Initial teacher education programmes provide student teachers with the desired competences to develop themselves as teachers. Although a generic framework for teaching competences is available covering all school subjects in Spain, the initial teacher education programmes curriculum does not specify which competences secondary mathematics student teachers should acquire during their initial teacher education. This explains why this study aimed at developing and validating a competence framework for secondary mathematics student teachers in Spain. Building on existing models and international frameworks, a preliminary list of competences was drawn up. The validation process was based on a Delphi method. In addition experts expressed their opinions about the formulation of the chosen competences. A comprehensive framework of 33 competences for secondary mathematics student teachers could then be validated.     

Beyond Stigma and Stereotypes: An Ethnographic Study on the Effects of School-Imposed Labeling on Black Males in an Urban Charter School

This study explores the ways in which school-imposed labeling in a “no-excuses” charter school that was explicitly designed for the purpose of benefiting Black students, impacts teachers’ perceptions of Black male students who were labeled as being high risk or struggling academically, and how these students perceive their own schooling experiences. A conceptual framework with the history of how and why Black masculinity is constructed as deviant and different in the context of U.S. schools, as well as the impact of labeling on Black male students’ learning and self-esteem are detailed. While centering the labeled-students’ experiences, we examine the interactions between key stakeholders (i.e., labeled-students, teachers/administrators, and non-labeled students) at the charter school and overall the findings speak clearly to how language of deficit and pathology impacted Black male students’ schooling experiences as they negotiate racial stigma as racialized bodies at a “no-excuses” public charter school.     

Muscle coordination during breaststroke swimming: Comparison between elite swimmers and beginners

The present study aimed to compare muscle coordination strategies of the upper and lower limb muscles between beginners and elite breaststroke swimmers. Surface electromyography (EMG) of eight muscles was recorded in 16 swimmers (8 elite, 8 beginners) during a 25 m swimming breaststroke at 100% of maximal effort. A decomposition algorithm was used to identify the muscle synergies that represent the temporal and spatial organisation of muscle coordination. Between-groups indices of similarity and lag times were calculated. Individual muscle patterns were moderately to highly similar between groups (between-group indices range: 0.61 to 0.84). Significant differences were found in terms of lag time for pectoralis major (P < 0.05), biceps brachii, rectus femoris and tibialis anterior (P < 0.01), indicating an earlier activation for these muscles in beginners compared to elites (range: ?13.2 to ?3.8% of the swimming cycle). Three muscle synergies were identified for both beginners and elites. Although their composition was similar between populations, the third synergy exhibited a high within-group variability. Moderate to high indices of similarity were found for the shape of synergy activation coefficients (range: 0.63 to 0.88) but there was a significant backward shift (?8.4% of the swimming cycle) in synergy #2 for beginners compared to elites. This time shift suggested differences in the global arm-to-leg coordination. These results indicate that the synergistic organisation of muscle coordination during breaststroke swimming is not profoundly affected by expertise. However, specific timing adjustments were observed between lower and upper limbs.     

Correcting for sample problems in PISA and the improvement in Portuguese students’ performance

The results of large-scale international assessments such as Programme for International Student Assessment (PISA) have attracted a considerable attention worldwide and are often used by policy-makers to support educational policies. To ensure that the published results represent the actual population, these surveys go through a thorough scrutiny to ensure their validity. One important issue that may affect the results is the occurrence of different participation rates across groups with heterogeneous average student scores. In this study, we illustrate how problems of representativeness of the samples may be corrected by the use of post-stratified weights. We use the case of Portugal, a country where we uncover a meaningful difference between the actual population and the PISA samples in terms of the distribution of students per grade and track of studies. We show that after post-stratification, the temporal evolution of the PISA scores is quite different from the one reported.