Supposer et postuler pour produire des connaissances scientifiques: une évidence ou une conquête théorique? Une étude des points de vue d'étudiants

Résumé De manière générale, l'évidence sensorielle et, plus particulièrement, visuelle constitue pour les étudiants le principal fondement du savoir scientifique: nul besoin de supposer pour connaître, tout est donné ou presque. Du point de vue de l'enseignement des sciences, cette croyance à saveur réaliste est particulièrement critique, notamment parce qu'elle conduit à penser que les concepts, lois et théories scientifiques procèdent d'un monde de matérialités plutôt que d'un monde de modèles et de relations. Au cours d'une recherche effectuée auprès d'un groupe-classe de 35 étudiants durant douze semaines, nous avons pu observer que, pour la majorité des étudiants, la compréhension du caractère construit et consensuel du savoir scientifique était facilitée par le développement d'une métaréflexion sur leurs propres productions de connaissance et les inévitables postulats et suppositions qui les fondent. Nous avons également pu observer qu'il découle de cette activité réflexive un modèle de science qui se distingue des modèles initialement tenus par les étudiants, par le pouvoir créateur et, surtout, le pouvoir de théoriser qu'il comporte: postuler, supposer, jauger collectivement de la plausibilité des résultats plutôt qu'en appeler à une instance occulte, voilà quelques-unes des conquêtes théoriques qu'ils ont effectuées et sur lesquelles nous allons nous attarder.

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Sensorial, and more specifically, visual evidence is generally regarded by students as the basis for scientific knowledge: no need to postulate to understand, all is almost or practically given. From a science-teaching standpoint, this rather realistic approach is critical and leads to the belief that scientific concepts, laws, and theories stem from a world of materiality rather than from a world of models and relationships. During a 12-week study a group of 35 college students, we observed that for the majority of them, the development of metareflection on how they produce knowledge, with the inevitable and inherent postulates and conjecture, facilitated their understanding of the constructed and consensual character of scientific knowledge. We also observed that this reflexive activity facilitated the development of a new approach to science that differed from those models previously used by the students in its creative potential and, more importantly, in the power of its theoretics: to postulate, suppose, and collectively estimate the plausibility of results rather than calling up occult instances. These and other theoretical achievements will be discussed in this paper.

     

Some recent Unesco publications

Notes and Reviews

Some recent Unesco publications     

Co-teaching as science in the schoolhouse: more questions than answers

The concept of science in the schoolhouse combines knowledge of research-based practices with the complexities of day-to-day life in schools. In this discussion, co-teaching is offered as an example of how advocacy for a practice can outpace the science that supports it. There is a push for co-teaching in contemporary schools, and special educators in great numbers are being asked to join with general educators in meeting the needs of students with disabilities. However, the science behind co-teaching to date is very limited. Studies have examined the implementation of co-teaching as a general service delivery option, but much less attention has been paid scientifically to the character and quality of the co-taught instruction or to the impact of co-teaching on student outcomes. Within this context, I also examine how Crockett's four recommendations to support science in the schoolhouse could address the questions about co-teaching for which there are few answers.     

Performance of the S[... formula ...]2 Statistic for the Multidimensional Graded Response Model

S−χ2 is a popular item fit index that is available in commercial software packages such as flexMIRT. However, no research has systematically examined the performance of S−χ2 for detecting item misfit within the context of the multidimensional graded response model (MGRM). The primary goal of this study was to evaluate the performance of S−χ2 under two practical misfit scenarios: first, all items are misfitting due to model misspecification, and second, a small subset of items violate the underlying assumptions of the MGRM. Simulation studies showed that caution should be exercised when reporting item fit results of polytomous items using S−χ2 within the context of the MGRM, because of its inflated false positive rates (FPRs), especially with a small sample size and a long test. S−χ2 performed well when detecting overall model misfit as well as item misfit for a small subset of items when the ordinality assumption was violated. However, under a number of conditions of model misspecification or items violating the homogeneous discrimination assumption, even though true positive rates (TPRs) of S−χ2 were high when a small sample size was coupled with a long test, the inflated FPRs were generally directly related to increasing TPRs. There was also a suggestion that performance of S−χ2 was affected by the magnitude of misfit within an item. There was no evidence that FPRs for fitting items were exacerbated by the presence of a small percentage of misfitting items among them.     

Academic self-concept and academic interest measurement: A multi-sample European study

Academic self-concept and academic interest are crucial concepts for understanding students’ academic achievement. Yet, few questionnaires currently exist that have been used and validated in more than one country. This study aimed at assessing these concepts using an academic self-concept questionnaire (Marsh, 1990) and an academic interest questionnaire (Corbière & Mbekou, 1997) with French and Italian student samples. Confirmatory Factor Analyses enabled us to assess the structure of the two questionnaires with regard to two academic subjects — Math and First Language (French or Italian) — and to determine the theoretical directions between the concepts. Results from Confirmatory Factor Analyses of both French and Italian samples supported a theoretical model in which academic self-concept and academic interest were intercorrelated, yet maintaining their unique characteristics. On the other hand, results from Multi-Sample Confirmatory Factor Analyses (French and Italian samples) endorsed a correlational model between the two concepts. Finally, the results indicated a significant and positive correlation between academic self-concept, academic interest, and academic achievement in both academic subjects.     

Work values in relation to gender and forecasted career patterns for women

This study examined the problem of life-style and career patterns for women. College students (367 males, 332 females) expressed their preferences for one of three career patterns for women combining work and family involvement and also answered a work values questionnaire. Results showed that 70.5% of the subjects expected women to attend school and/or work outside the home first and to have their child(ren) only after they have established themselves in a career. Forecasting of career patterns for women was significantly related to subjects' work values. Results confirmed previous findings and also indicated new trends in work values that differentiate between male and female college students.Université de MontréalUniversité du Québec à Trois-Rivières     

Perceived workplace conditions and first-year teachers’ morale, career choice commitment, and planned retention: a secondary analysis

The relationships between perceived workplace conditions and morale, career choice commitment, and planned retention were examined for first-year teachers in the United States. A nationally representative sample of first-year teachers (K-12) was extracted from the United States Department of Education's Schools and Staffing Surveys database for 1987–88 and 1993–94. A school culture that supports collaboration and teacher participation in decision-making was most strongly related to higher morale, stronger commitment to teaching, and intentions to remain in the profession. The discussion highlights the importance of providing supportive workplace conditions during a formalized induction year that socialize new teachers into a collaborative and participatory work-ethic that sustains commitment.