M.Ed. / The aim and purpose of the study is to explore the Natural Science (NS) teachers' perceptions of their teaching competence in Senior Phase township schools in Soweto. An in-depth literature review on theoretical perspective in Natural Science teachers' perceptions of their teaching competence in Senior Phase indicated that these partially addressed the key questions of the study, namely: what are the perceptions ofNatural Science teachers' about their teaching competence in Senior Phase township schools? What competences are perceived to enhance and contribute to Natural Science teaching in Senior Phase schools m Soweto? This study identifies a number of motivational competences that have been derived from current theories. The theory developed from the literature on NS teachers' competences review, facilitated the development of an empirical research. Qualitative research was conducted to explore NS teachers' perceptions of their teaching competence in Senior Phase schools in Soweto. This was with a view to facilitating the improvement thereof wherever necessary. Seven NS teachers from three Diepkloof Senior Phase schools were sampled. It also emerged from the findings of the research that there are, teachers who are not qualified to teach NS subject at the Senior Phase level. There also seems to be a lack of competent N.S. teachers in Senior Phase schools in Soweto. The high numbers of learners in NS classes create challenges for NS teachers to provide individual attention to learners. NS laboratories are poorly equipped and that the district officials do not provide sufficient support to NS teachers so that they can be more effective in their teaching. The study gave the researcher the opportunity to explore the teaching competence ofNS teachers in three Senior Phase township schools in Soweto, where the competence gap had already been expressed. There were many challenges identified by the findings. A comprehensive picture of the many inter-dependant aspects affecting the NS teaching competencies was acquired. The research conducted gave the researcher the motivational framework to establish both the current level ofNS teaching competence and the ideal levels of competences to which the three schools and other schools nationwide could aspire.

M.Ed. (Subject Didactics : Natural Sciences) / Please refer to full text to view abstract.

M.Ed. / Students exhibit misconceptions or deviations from universally accepted concepts. Constructivists trace these misconceptions back' to the unique conceptual frames of reference of students. Ausubel (1985:82) named prior knowledge as the single most important factor influencing learning. New teaching strategies were designed to prevent or eliminate these misconceptions. The strategies are based on guidelines postulated by researchers such as Posner and his co-workers (1982:211). Several strategies use media to motivate students or provide a more concrete base for concept formation. The side effects of the utilization of media are important to designers and users of media. An empirical investigation was launched to determine whether media could also stimulate the formation of misconceptions. The investigation indicated that two dimensional representations of atoms, molecules and ion lattices can lead to misconceptions. Greater care should be taken in the selection of illustrations for textbooks and other media. If these side effects are taken into account by media designers and teachers, media can play a major role in the prevention and elimination of misconceptions.

The new political dispensation in South Africa has seen a lot of changes taking place. The democratic wind, which has been blowing in all spheres of the political arena, could not leave out Education. This has led to the transformation in education and the revision of the curriculum guided by the Outcomes-Based Education philosophy (OBE). Thus, require education authorities as well as educators to look at education more comprehensively. The challenge posed to educators now is to develop tools and strategies that will make learning accessible to as many learners as possible and to teach for understanding and construction of knowledge. The principal objective of this study was to investigate the important role the learner's prior knowledge plays and the use of different tools and strategies in stimulating conceptual understanding and construction of knowledge of redox reactions. This was done using learners' own investigations, practical activities, teaching settings and a workshop. The findings show that the learners lacked organized and structured prior knowledge. Learners could not integrate prior experience with new experience. The main issue seems to be the failure of learners to relate classroom experience to everyday redox phenomena. Possible reasons are discussed with some implications for teaching redox. The study further postulates that to assist learners to develop conceptual understanding of redox reactions, different tools and strategies should be employed and teaching made relevant to real-life situations. In so doing, redox concepts would not be abstract to learners.

This research report describes an investigation that involved the collaborative participation of teachers in the redevelopment of parts of the Junior Secondary General Science syllabus. The redevelopment tried to implement environmental education as an innovation. There are two central assumptions that the investigation has made. The first assumption is that the the present Junior Secondary General Science syllabus lacks environmental relevance and therefore the pupils are inadequately prepared to deal with environmental problems. The introduction of a curriculum innovation like environmental education has the potential to bring greater environmental relevance to the syllabus. The second is that such an innovation can be more successfully implemented at schools if it involves the collaborative participation of teachers in the redevelopment of the syllabus. This assumption is made since evidence suggests that curriculum change can be a process of social reconstructive process when it takes place in situ and where teachers and pupils reshape the curriculum in the classroom as the teaching and learning progresses. An action research approach was selected since it is compatible with collaborative teacher, participation in curriculum development. The research design involved three parallel case studies: 1. Clermont Zone, 2. Durban Teachers Centre, 3. Edgewood College. The research confirmed that the Junior Secondary General Science syllabus is perceived by teachers to lack environmental relevance; that teachers, while initially resisting participation in the curriculum development process, were willing to participate if it revolved around their curriculum problems. Significant features of collaborative teacher participation in curriculum development seem to be the co-creation of context by the teachers, the need for institutional support, the production of curriculum materials and the need for networking and intercontextual dialogue. Teachers initially had limited curriculum development skills which needed to be developed. This research process has implications for practical actions 'to enable' the transformation of existing curriculums, and assisting the development of a more democratic and effective education system.

The Namibian Physical Science Higher Level Syllabus requires students to study the topic on chemical equilibrium. This section has proven to be one of the most difficult for Namibian learners as reflected by their poor responses to questions in the Grade 12 NSSC ‘H’ examinations. Triggered by these discoveries, I decided to conduct a research on how teachers mediate learning of the topic on chemical equilibrium in a Namibian context. Conducted at a private school in Windhoek, the study involved two experienced Grade 11 Physical Science teachers renowned for good results. I adopted a qualitative case study underpinned by an interpretive paradigm. Sense making of concepts on chemical equilibrium was my unit of analysis. To generate data, I used document analysis, semi-structured interviews, lesson observations, which were videotaped as well as stimulated recall interviews. Vygotsky’s mediation of learning and social constructivism blended with Shulman’s pedagogical content knowledge (PCK) were the theoretical frameworks adopted in the study. During the analysis process, there was grouping of data into categories. These included teacher-learner interactions as emphasized by Vygotsky’s mediation of learning and learners’ challenges according to PCK. I used an inductive approach to identify emerging themes from my data. The themes were colour coded and the developed into analytical statements. Data triangulation, member checking, and peer review ensured data validity and trustworthiness. Stimulated recall interviews conducted while watching the videos with the two teachers, complemented these approaches. My findings were that teachers extensively used various meditational tools such as prior knowledge, language, analogies and an equilibrium game to mediate learning. The teachers experienced numerous challenges during mediation of learning, including language difficulties and learners’ failure to comprehend complex chemical equilibrium concepts. Notwithstanding, the teachers in this study managed to some extent to overcome the challenges by exhibiting facets of advanced PCK.

The Namibian government’s language policy for schools has opted for English as the official language of education. But the use of English in Namibian schools has nevertheless presented certain challenges. Although the Ministry of Education has chosen English as the language of instruction from upper primary (Grade 4) up to the tertiary level, it has been found that English proficiency is poor among both learners and teachers. It is against this backdrop that this study sought to investigate how Grade 7 Natural Science teachers mediate learning through code-switching from English to Silozi in the Zambezi Region of Namibia. The study explored Natural Science teachers’ perceptions and experiences of code-switching, how they and their learners make sense of concepts in science classes when code-switching is applied, and lastly, how code-switching from English to Silozi enables or constrains learning in Natural Science classes. The main question is: How do Grade 7 Natural Science teachers mediate learning through code-switching from English to Silozi? A qualitative case study underpinned by an interpretive paradigm was carried out at Zebra School (pseudonym) in the Zambezi Region of Namibia with two participant teachers. My unit of analysis was mediation of learning through code-switching, and data were obtained from lesson observations, questionnaires, interviews and document analysis. A variety of data gathering technique was employed for triangulation purposes to enhance the validity and trustworthiness of the data. During the data analysis process, data were grouped into common themes and subsequently organized into analytical statements in relation to the research questions. It was found that code-switching was widely employed in Grade 7 Natural Science classes in the Zambezi Region. It was also found that teachers code-switch to help learners understand the subject content, to explain concepts, to emphasize points and to include learners’ participation in the subject. The findings also revealed that some few teachers were against code-switching because examinations are written in English and the language policy does not recommend code-switching. Notwithstanding this, since the majority of teachers do code-switch to support their learners’ understanding in science classes, I recommend that education curriculum planners should include code-switching in the curriculum guidelines, and that the practice should be officially acknowledged as a legitimate strategy for teachers.

The research presented in this thesis is situated within an interpretivist paradigm. Within this paradigm, a qualitative case-study research approach was adopted. This seemed most appropriate in my research project since the main focus is on elicitation of prior knowledge and incorporation of such knowledge into 'hands-on' and 'minds-on' practical activities with a view to improving conceptual development. For the purposes of this research project, I designed an interactive teaching and learning unit in electrostatics as an attempt to put into practice a learner-centred approach. This approach, in my view, is in line with the new curriculum in South Africa. The emerging central theme of this thesis is the notion of active participation by learners during teaching and learning. This study was carried out over a period of two years and involved my grade 9 learners, who participated voluntarily. The research process documented in this thesis has been conceptualised into two phases. Phase one was concerned with the elicitation of learners' prior knowledge around lightning. In phase two, learners were engaged in 'hands-on' and 'minds-on' practical activities, and key concepts were identified to ensure conceptual development. The data was collected using a variety of data collection tools, namely: focus group interviews, follow-up whole-class semi-structured interviews, worksheets, videotaped lessons and photographs. The analysis of data revealed that learners come to class with prior knowledge concerning lightning. Within this prior knowledge it was found that there were both ‘scientific’ and ‘non-scientific’ concepts. The identification of key concepts during practical activities was found to be very useful in promoting learning. However, the incorporation of prior knowledge into practical activities posed a challenge and needs further research. iv This research study also highlights some insights into some of the complexities of elicitation and incorporation of learners' prior knowledge, and conceptual development in science classrooms. It also demonstrates the challenges and possibilities during teaching and learning as well as the realities of the demands of the new curriculum and OBE in South Africa, in particular, in historically disadvantaged schools

This study reports research on how student teachers in Science at Mutare Teachers' College in Zimbabwe worked with indigenous knowledge practices in relation to science concepts in the secondary school syllabus. The study was conducted among first-year science students and involved them in developing science learning activities for a peer-teaching process that was part of their course. The research was undertaken during a review ofthe college syllabus and as a study to inform the Secondary Teacher Training Environmental Education Programme (ST²EEP). The research design involved the researcher in participant observations and interviews with rural people to document indigenous knowledge practices and to develop materials for the students to work with in the lessons design part of the study. The student teachers used the documented practices to generate learning activities and lesson plans to teach the science concepts they had identified. A peer review session and focus group interviews followed the lesson presentations. Findings from the research point to the rural community being a repository of diverse indigenous knowledge practices. Student teachers showed that they had prior knowledge of both indigenous knowledge practices and science concepts when they come to class. Student teachers were able to relate indigenous knowledge practices and science concepts in ways that have the potential to enhance the learning of science in rural school contexts that lack laboratories and science equipment. The scope of the study does not allow for anything beyond tentative conclusions that point to the need for further work to be undertaken with student teachers and for the research to be extended to teaching and learning interactions in schools. Recommendations are also made for further resource-based work to be undertaken within the forthcoming St²eep implementation phase in 2007.

This study took place at a private high school in the Kavango region with my 32 grade 10B learners as the research participants. Its objective was to investigate how the grade 10 learners make sense of concepts on refraction of light through exploring their cultural beliefs/everyday experiences about the rainbow. This research study was essentially triggered by my own classroom experience of teaching the topic on refraction of light. In order to achieve the goal of this research, a qualitative case study located within an interpretive paradigm was adopted. To gather data I used multiple data gathering techniques such as brainstorming session, learners conducting interviews in the community, practical activities and focus group interviews. This resulted in descriptive data that qualified to be analyzed in a qualitative way. The themes that emerged from the generated data were coded using upper letter cases and various colours. A methodological triangulation was employed by using multiple data generation techniques. Member checking during focus group interviews also ensured validity in this case study. The findings of this study revealed that the use of learners’ cultural beliefs/everyday experiences can be used to enhance learner engagement, meaning making and conceptual development during the science lessons. In addition, the ways in which practical activities are designed and presented to learners in the science classroom determine learners’ participation and conceptual attainment. Therefore, based on my research findings, I recommend that teachers need to be trained to be able to elicit and integrate learners’ cultural beliefs/everyday experiences in conjunction with hands-on practical activities which focus on conceptual development during their science lessons. However, although this study had many benefits, it also showed that it is not easy to close the gap between learners’ prior everyday knowledge and school science. This warrants further research.