Philosophiae Doctor - PhD / The study investigated the impact of a dialogical argumentation instructional model (DAIM) as an intervention teaching strategy to assist pre-service science teachers to implement integrated science-indigenous knowledge (IK) lessons during their seven week block teaching practice at schools in the Western Cape. This imperative is found in Specific Aim 3 of the Curriculum and Assessment Policy Statement (CAPS) of the South African School Curriculum (Department of Basics Education, 2011). The study focussed on the pre-post conceptions of pre-service science teachers’ conceptions of the nature of science and the nature of indigenous knowledge. In addition the study examined pre-service teachers’ sense of self-efficacy in deploying a dialogical argumentation instructional model to implement an integrated science-IK lesson. The sample consisted of a cohort of thirty (30) Post-graduate Certificate of Education (PGCE) students training to teach at the Further Education and Training (FET) phase of school. They were a combined class enrolled for method in Natural Sciences, Life Sciences and Physical Sciences. A mixed methods approach was used to generate quantitative and qualitative data using a series of questionnaires, reflective diaries, journals and focus group interviews. Transcripts provided a rich bank of data of which only exemplars were used to highlight trends and to illustrate how theoretical constructs were used as analytical tools. The theoretical constructs used were Toulmin’s (1958/2003) Argumentation Pattern (TAP), Ogunniyi’s (1997) Contiguity Argumentation Theory (CAT) and Banduras’ Social Cognitive Theory (1986). The findings showed that the pre-service teachers appeared to overestimate their sense of self-efficacy (i.e. the ease and comfort) in using DAIM to implement a science- IK curriculum at the pre-test than at the post-test. The study also identified important implications for policy, teacher training programmes, teaching practice, pre-service science teachers, learners and further research. Furthermore, the pre-service reflective experiences indicated their increased awareness of the challenges and successes related to using dialogical argumentation to integrate a science-IK lesson. The most important contribution of this study to an argumentation paradigm was the emergence of a visual model called the Pyramid Argumentation Model that succinctly connected the apparent disparate module units in a holistic way (To be discussed in follow-up reports). The findings revealed numerous complexities as the participants navigated their own cosmologies of a scientific worldview and that of their indigenous knowledge worldview. Finally, the findings have not only corroborated the findings in earlier studies with respect to the merits and demerits of argumentation instruction but also identified various challenges that prospective and even practicing teachers might encounter in an attempt to make school science relevant to the sociocultural environment of learners especially those living in indigenous or traditional societies like the participants in this study.

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Cette recherche a été menée auprès d'étudiants de Classes Préparatoires aux Grandes Ecoles Scientifiques. Un de ses objectifs est d'analyser l'influence des variables motivationnelles sur la performance académique. L’auto-efficacité académique, l’orientation des buts et la motivation autodéterminée sont souvent citées pour leur rôle majeur dans la réussite universitaire. Ces variables sont issues de cadres théoriques distincts et nous souhaitons étudier comment elles s'influencent mutuellement. Des outils psychométriques, dont une échelle d’auto-efficacité académique, ont été créés et validés. Des analyses en pistes causales ont été effectuées afin de proposer un modèle traduisant les influences qui existent entre variables motivationnelles et performances académiques.Nos résultats montrent que :- l’auto-efficacité est la seule variable motivationnelle à avoir une influence directe sur les performances académiques ;- le but d’approche de la maîtrise est sous influence de l’auto-efficacité et une orientation vers ce type de but influence positivement la motivation intrinsèque et négativement l’amotivation ;- le but d’approche de la performance a une influence positive sur les différentes formes de motivation extrinsèque et, parmi ces dernières, la motivation extrinsèque à régulation identifiée influence positivement l’auto-efficacité tandis que la motivation extrinsèque à régulation externe l’influence négativement ;- l’amotivation influence négativement l’auto-efficacité académique ;- l’impact de l’amotivation sur les performances académiques est totalement médiatisée par l’auto-efficacité.Des prolongements de cette étude et certaines applications sont proposés. / This research has been carried out among French science students enrolled in CPGE (Classes Préparatoires aux Grandes Ecoles). One of its objectives is to study how motivational variables influence academic achievement. Academic self-efficacy, achievement goals or self-determined motivation are reported to play an important part in academic achievement. By relating self-efficacy, goal orientations and motivation, as conceptualized in self-determination theory, to both preceding and subsequent academic achievement, it is possible to further investigate the structural relation between these variables. Therefore, we aim at analysing the mutual influences which exist among them.Psychometric tools, among which an academic self-efficacy scale, were created and validated. Path analysis were performed in order to produce a multivariate model including motivational variables, previous academic performance and subsequent academic achievement. Our results showed that:- self-efficacy is the only motivational variable that directly influences academic achievement; - mastery approach goal, which is influenced by self-efficacy, enhances intrinsic motivation but is negatively related to amotivation;- performance approach goal enhances extrinsic motivation and identified regulated extrinsic motivation is positively related to self-efficacy while externally regulated extrinsic motivation is negatively related to it;- amotivation is negatively related to self-efficacy;- Self-efficacy beliefs are mediators between amotivation and subsequent academic achievement.Future research could build on these findings. Suggestions of applications are provided.