Browsing by Author "Ndlovu, Bongani Prince"

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    Examining the development of topic specific pedagogical content knowledge in stoichiometry in pre-service teachers
    (2017) Ndlovu, Bongani Prince
    Over the past three years, National Senior Certificate diagnostic reports reported that learner performance in key chemistry topics remains an aspect for concern. In these reports, poor understanding of stoichiometry is identified as an underlying factor. On the other hand, the status of mathematics and science teaching has been under critique by several education researchers, pointing to poor teacher training in the subjects. One possible way to respond to the challenge in science education is to introduce and emphasize the development of Topic Specific Pedagogical Content Knowledge (TSPCK) as the professional knowledge for teaching science topics in Initial Teacher Education (ITE) programme. TSPCK is renowned for enabling teachers to pedagogically transform difficult content of specific science topics into forms best understandable by learners. This study examined the impact on the quality of TSPCK following an intervention that explicitly targeted the development of the competence to transform content knowledge using stoichiometry as a topic of learning. This examination happened as teacher plan to teach the topic. The study followed a Mixed Method research design and a case study as a research strategy. It was located in the methodology class of physical science IV. The participants were 10 pre-service teachers who were in their final year of Bachelor study in education (B. Ed). They were bound by the requirements of the course and their common choice of physical science as their major subject. These pre-service teachers were exposed to a TSPCK based intervention that explicitly targeted the development of TSPCK component interaction. More evidence of component interactions was comprehended as developing quality of TSPCK. Quantitative data was collected as a set of pre- and post-intervention TSPCK tests using existing, specially designed tools that were developed and validated in a separate study. Five (5) of the then pre-service were followed a year later after the intervention to measure the quality of TSPCK in the topic of intervention in order to determine the extent of retention of the quality of TSPCK since the intervention. Qualitative data was collected through face to face interviews to confirm observed patterns of retention. The findings in this study indicated that pre-service teachers experienced a visible improvement in the quality of their TSPCK in stoichiometry as a direct result of the intervention. Pre-service teachers showed more evidence of component interactions post the intervention. The results further indicated that pre-service teachers experienced the components of TSPCK to have different levels of difficulty when using them to transform the content in stoichiometry during planning. The component of ―conceptual teaching strategies‖ was found to be the most difficult. A year later, the quality of TSPCK in planning to teach the topic of the intervention was found to have been retained by the then pre-service teachers. Recommendations about the implementation of TSPCK in core topics in ITE are made. Firstly, for initial teacher education, it is recommended that courses such as methodology for teaching chemistry be structured as TSPCK based intervention. Secondly, more work need to be done in the examination of retention span of TSPCK. Thus, similar studies must be conducted in an effort to increase empirical evidence about the extent at which TSPCK is retained by beginning teachers.
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    The Development and Validation of a Theoretical Construct Describing Content Knowledge for Teaching Science: A Case Study with Organic Chemistry
    (University of the Witwatersrand, Johannesburg, 2023-08) Ndlovu, Bongani Prince; Mavhunga, Elizabeth
    The distinction between academic disciplines and school subjects has not found enough attention in teacher education research. Thus, a question about the nature of content knowledge suitable for pre-service teacher education and as a base for PCK development in science was raised. The purpose of this study was to conceptualize and validate a theoretical construct that describes a version of content knowledge appropriate for training secondary school science teachers. This construct was termed Teacher-related Science Content Knowledge (TerSCK). The study followed the traditional two-step process of developing a theoretical construct. The first phase entailed the conceptualization of the envisaged theoretical construct through a systematic literature review. This was followed by the second phase which empirically proved the validity of the conceptualization as a theoretical construct TerSCK. The validation of the conceptualization was located in the methodology class of the 3rd year pre-service science teachers (PSTs), who majored in physical sciences. As such, the study employed a mixed-method research design with a whole class sample of 35 PSTs. The PSTs were exposed to a TerSCK-based intervention to explore various shifts in the quality of their content knowledge for teaching Organic Chemistry. The findings from the systematic review presented TerSCK as a unique construct located between the academic discipline content and the school science content knowledge. The construct is described through three dimensions that describe the relationship between academic discipline and school subjects. These relational dimensions are the “logical, epistemological and social dimensions”. Translating the relational dimensions into the curriculum through Schwab’s three faces yielded five curriculum elements of TerSCK. These are (i) Fundamentals of the discipline on the topic, (ii) Interconnections between the concepts that make up the fundamental concepts, (iii) Tensions emerging from the process of filtering the discipline fundamentals into the school curriculum scope, (iv) Scientific and other modes of inquiry from other disciplines, and (v) Cultivating social agency. Findings emerging from the empirical study presented the TerSCK construct as valid based on the acceptable calculated fit statistics values at 0.5 to 1.5 and -2.0 to +2.0 for MNSQ and ZSTD, respectively. The empirical findings further indicated that participant PSTs experienced a significant improvement in the quality of TerSCK after the intervention. Implications for initial teacher education have been drawn and the recommendations include large-scale research on the nature of TerSCK in organic chemistry and other chemistry curriculum topics.