Learning contexts for young children in Chile: process quality assessment in preschool centres

ITERS (Infant and Toddler Environment Rating Scale), ECERS (Early Childhood Environment Rating Scale) and SACERS (School Age Care Environment Rating Scale) are used to measure process quality. The psychometric characteristics of the three scales are established, and high reliability and adequate validity are observed. The global quality process for the classrooms under study is less than good; process quality based on the direct interaction of adults with children in the classroom is better when compared with quality related to the experiences that children have with learning materials, equipment and space. The associations between child development outcomes and childcare quality are examined. Vocabulary, social development and adaptive behaviour show a strong and positive association with ECERS. Hierarchical regression analyses show that preschool quality has a significant and persistent effect in the variation of child outcomes (5%). These effects are maintained three years later, when children are in primary school (8%).     

Referential perspective and instruction: A study on teacher-student interaction and text remembering

The aim of this paper is to study the role ofteacher-student interaction, in the acquisitionof text comprehension and memory skills from asocio-cultural approach. In our view, one ofthe most important areas of neglect in cognitive research in this field is the interactional nature of that development. We intend to establish the way in which teacher-student interaction and, specially, the use of some specific semiotic means mayfacilitate the acquisition and internalizationof general strategies for understanding andremembering expository texts. The role ofreferential perspective (Wertsch, 1989) in theinternalization of complex text study actionsis analysed.The task was to study three expository textsthat were similar in their structure. Thecontent of the texts was analysed in terms ofidea-units (Meyer, 1984). Each text was formedby idea-units from three different levels: mainideas, secondary ideas and details. A categorysystem for the analysis of study and recall ofthe text is developed. In the study phase theanalysis proceeded in two steps: study actionsand text ideas. In the recall phase, two types ofindexes (number of ideas and degree ofclustering) were considered. For the analysisof instructional actions, both the nature ofinstruction and referential perspective wasrecorded.     

Mid-life career changing to teaching profession: a study of secondary school teachers in a rural community

There are many research projects focused on pre-service teachers’ professional development programmes but only a few focus on mid-life career-changing teachers’ career decision. This paper worked with data collected from semi-structured interviews with 11 mid-life career-changing secondary school teachers. The aim was to understand the career decisions of these participants and how they made sense of their new profession during their mature adulthood in Indiana, USA. 11 mid-life career-changing secondary school teachers referred to ‘changing the next generation with industry experience’, ‘rich life experience’, ‘life-long learning’, ‘knowledge transferring’, and ‘make a difference’ to describe their current occupation as career changing secondary school teachers. The findings also outline how to reform the curriculum and instruction of the pre-service teachers’ professional development programmes.     

Analysis of the Meanings of the Antiderivative Used by Students of the First Engineering Courses

In this article, we present the results of the administration of a questionnaire designed to evaluate the understanding that civil engineering students have of the antiderivative. The questionnaire was simultaneously administered to samples of Mexican and Colombian students. For the analysis of the answers, we used some theoretical and methodological notions provided by the theoretical model known as Onto-Semiotic Approach (OSA) to mathematical cognition and instruction. The results revealed the meanings of the antiderivative that are more predominantly used by civil engineering students. Also, the comparison between the mathematical activity of Mexican and Colombian students provides information that allows concluding that the meanings mobilized could be shared among their communities and are not particular of their classroom or university.     

Gender in plants

Complex evolutionary forces determine whether plants are male, female or hermaphrodite throughout their lives or whether they switch from one sex to another. This article explores these often conflicting forces and seeks answers for sex change in plants.