Mathematics, Science and Technology Education
Permanent URI for this collection
Browse
Browsing Mathematics, Science and Technology Education by Author "Imenda, S.N."
Now showing 1 - 7 of 7
Results Per Page
Sort Options
- ItemAlleviation of conceptual difficulties in grade 12 mechanics by addressing the challenges emanating from alternative conceptions(University of Zululand, 2012) Mchunu, Stephan Paraffin; Imenda, S.N.This study sought to determine the conceptual difficulties experienced by grade 12 physical science learners with regard to mechanics. It also sought to identify the most prevalent alternative conceptions among grade 12 physical science learners in the area of mechanics, and develop interventions to alleviate the identified conceptual difficulties and alternative conceptions. In this regard, the study compared the effectiveness of a traditional lecture, outcomes-based education (OBE) and blended instructional approaches in alleviating or overcoming the identified conceptual difficulties and alternative conceptions concerning mechanics. The aspects of Mechanics dealt with in this study were: work and energy, motion on the inclined surfaces, projectile motion, force concept, static objects and Newton’s Third Law of Motion. In addressing the above research problem, the study developed and presented a theoretical and conceptual framework derived from the review of relevant literature, in line with the research questions of the study. The conceptual framework developed was based on the constructivist views of learning. A total of one hundred and forty (140) grade 12 physical science learners from Empangeni Education District were involved in this study. The study followed the quasi-experimental non-equivalent comparison-group research design. Though quantitative in design, the study also used qualitative research methods. Thus, both quantitative and qualitative data were collected. From the quantitative data, the findings showed highly statistically significant gains between pre- and post-test scores of OBE and blended approaches in particular. The average normalised gain score concept was also used determine the most effective instructional approach. Convenience sampling was used to select participating schools. A Test in Basic Mechanics (TBM) was designed to assess the learners’ understanding of the most basic concepts in mechanics. The TBM was administered both as a pre- and post-test to the three groups (traditional, OBE and blended groups) to determine the level of experience, knowledge, pre-existing alternative conceptions, level of understanding of basic concepts and principles on mechanics topics identified at the start of the investigation. As a pre-test, the TBM was also used to identify the specific conceptual difficulties and alternative conceptions in mechanics. The identification of the conceptual difficulties and alternative conceptions after the pre-test was followed by three instructional interventions (the traditional, OBE and the blended approach). The three interventions addressed the same mechanics topics mentioned above. These interventions were then followed by post-tests to ascertain the effectiveness of the interventions in addressing the identified conceptual difficulties and alternative conceptions, as well as any conceptual difficulties and alternative conceptions which were resistant to change even after the interventions. The results revealed that the learners experienced conceptual difficulties with regard to (a) resolving the components of the weight; (b) work concept; (c) work-energy theorem application; (d) kinetic energy concept; and (e) principle of conservation of mechanical energy application. Regarding the most prevalent alternative conceptions in mechanics, learners held eight alternative conceptions related to kinematical and dynamical concepts. Alternative conceptions held by the learners in mechanics concerned the following: (a) the acceleration and velocity of projectile motion; (b) weight/mass of an object as related to Newton’s Third Law of motion; (c) force concept; (d) objects in motion; (e) static objects; (f) Newton’s Third Law of motion; (g) acceleration of projectiles; and (h) active force. The average normalised gains for the traditional, OBE and blended instructional approaches were (g) = 0,20; (g) = 0,30; and (g) = 0,60, respectively. This confirmed the statistical analysis computed using One Way Analysis of Variance (ANOVA), that the blended instructional approach was the most effective instructional approach in alleviating the conceptual difficulties and alternative conceptions in mechanics. Qualitative data showed that most of the pre-existing conceptual difficulties and alternative conceptions appeared to have been alleviated, although not completely overcome by the interventions. There were statistically significant differences that were found among the traditional, OBE and blended instructional interventions. It is therefore noted that the blended instructional approach to teaching and learning can have a significant contribution to overcoming conceptual difficulties and alternative conceptions in mechanics, and the improvement of efficiency of learning. The study concluded that conceptual difficulties and alternative conceptions in mechanics could best be alleviated using the blended approach to teaching and learning. A number of recommendations were also made. Some alternative conceptions were resistant to change in the face of the traditional lecture based teaching. This meant that a more powerful teaching technique had to be devised. Thus, physical science educators should be encouraged to use the blended approach to teaching and learning in order to accommodate all learners in a class. Blended teaching and learning is mixing of different teaching and learning environments – mainly manifested in combining face-to-face instruction with the computer mediated-instruction. In one class of learners there are different learner characteristics. Learners learn in different ways like learning through lecture (telling), discussion, problem solving, practical work, discovering, experimenting, using pictures and diagrams, videos and demonstrations.
- ItemChallenges facing physical science educators in the implementation of the National Curriculum statement: the case of the Empangeni Education District(2009) Mchunu, Stephan Paraffin; Imenda, S.N.; Ntuli, M.S.This study looked at the implementation of the NCS physical science as a major curriculum change. As Imenda (2002:4) states "curriculum change entails that educators, learners, administrators, and all those with a part to play in the actualisation of the new curriculum have to see and do things differently". He further asserts that "this invariably means embracing a new system of doing things in terms of a sound philosophical basis, curriculum content description, beliefs, values, convictions and practices". He further posits that "the transition from an 'old' curriculum to a new one could therefore present difficult challenges and problems". According to Imenda (2002:4), "the espousal of OBE by South Africa's Ministry of Education to apply to all levels of the education system has presented a number of major challenges". Indeed, there are many challenges facing physical science educators in the implementation of OBE, including overcrowding, language mismatching, teacher unpreparedness, non-delivery of OBE resources, inadequate facilities and resources (Adler & Reed, 2002:60-65; Jacobs, Gawe & Vakalisa, 2002:106-107 & De Waal, 2004:63-66). In particular, student assessment is an integral part of the outcome-based approach to curriculum design and implementation. Accordingly, the implementation of valid and reliab!e assessment procedures is a centre piece 1 of outcomes-based education (OBE). The paradigm shift from the traditional curriculum to an OBE curriculum requires changes to be reflected in assessment practices. Thus, unless assessment is properly aligned with the curriculum reform and teaching, the desired changes in education will be extremely difficult, if not impossible, to realise. The current reform initiative in science education emphasizes the importance of teaching learners to be critical thinkers and problem solvers. Assessing whether learners understand basic science concepts and can use them to solve problems requires an approach very different from traditional tests that primarily measure the recall of isolated facts. As Rasool (1999: 177) points out: The traditional educational paradigm prevalent in schools is characterized by a heavily content-driven, teacher centered approach. Subjects are broken down in terms of rigidly defined syllabuses and tend to be knowledge focused rather than performance focused. While methodologies vary, the role of the teacher as a subject matter expert is largely that of provider of content. The following points are noted from the traditional curriculum: • Learners are often passive recipients of knowledge. • Emphasis is on memory, practice and rote learning. • Promotion of learners is based mainly on pencil and paper examinations. • Little or no emphasis is on creativity and the curriculum is overloaded with content; no attention is given to skill. • No emphasis on co-operative learning and discovery learning. • Competencies, knowledge and skills are not improved. 2 • Skills acquired outside school are regarded as inferior and largely not recognized (Department of Education, 1997: 27). In the new curriculum, the full scientific power of pupils is assessed. Students' performance is compared with established criteria"; students are viewed as active participants in the assessment process; assessment is regarded as continual and recursive. Overall, outcome-based assessment focuses on work done, assesses understanding and is motivational in nature (Lorraine, 1998: 58).
- ItemEducation for sustainable development of medicinal plant sellers-challenges in relation to marketing, sales, storage and conservation(University of Zululand, 2015) Ndawonde, Busisiwe Gugu; Imenda, S.N.The purpose of this study was to introduce the concept of sustainability to medicinal plant sellers by a way of a non-formal environmental education programme. This was done for future generations to enjoy the benefits of medicinal plants whilst enhancing the livelihoods of medicinal plant sellers who depend on harvesting and selling these plants. Having realised that medicinal plant sellers were harvesting in an unsustainable manner, the researcher could not ignore this situation. There was a need to assist medicinal plant sellers to reflect on ways they conducted their businesses. The researcher deemed it necessary to alert the sellers to the necessity of harvesting plants wisely and consider future generations by taking preventive actions before many of the plants become extinct. The design of this study was a mixture of qualitative and quantitative research approaches. On one hand, the quantitative approach involved a survey using a semi-structured questionnaire, which was administered through face-to-face interviews. On the other hand, the qualitative method is by way of a case study in which data were collected through open-ended questions, focus group discussions and a workshop. The questionnaires were semi-structured. The research survey instrument served as the diagnostic tools to identify challenges that confronted the medicinal plant sellers. Information obtained through this instrument was explored in a workshop, which was designed to be an intervention programme. The programme engaged medicinal plant sellers and the researcher in discussions about sustainability of medicinal plants. The assessment of the intervention programme was carried out by means of site visit and open-ended interviews. Data were coded and grouped according to themes. They were interpreted, analysed, presented according to the set perspectives such as tabulation, graphing and direct citations from the respondents. iii The results showed that there were problems in the medicinal plant selling businesses, with regard to storing, marketing and conserving medicinal plants. Storage was problematic in the sense that some plants need to be dried out before being stored. During rainy seasons this was hard to be achieved since the drying out is done outdoors. Marketing was also problematic due to price competition among medicinal plant sellers. There was no uniformity in pricing. Another problem was lack of record keeping. There were no records of revenue and expenditure that would help determine profit margins if any. After exploring these issues in the workshop, the results from the assessment of the intervention programme showed that the medicinal plant sellers had revisited prices for their medicinal plants. Conservation was one of the areas that were explored as ways of sustaining medicinal plants. Among the conservation methods that were discussed in the study, cultivation of the medicinal plants was found to be a major challenge. The study revealed that in spite of the slow growth rates of medicinal plants, non-availability of land and irrigation problems posed as challenge of medicinal plant cultivation. The study intervened by engaging with medicinal plant sellers in discussions to start their own home gardens. The intervention programme had a way to supplying medicinal plant seedlings to the medicinal plant sellers. The sellers were also taught how to cultivate medicinal plants. The assessment of the study intervention also revealed that some of the medicinal plant sellers were not yet accustomed to methods of record keeping. Nevertheless, the intervention programme introduced methods of recording sales such as banking of revenue and keeping deposit slips. When the second phase of assessment programme was conducted, the medicinal plant sellers reported that they had adopted banking of their revenue. Banking could however; banking could not show all records, particularly expenditures. Although medicinal plant sellers were shown how to record expenditures and sales of the medicinal plant material, they had not practiced those recording techniques during the assessment of the workshop. Banking money by the medicinal plant sellers was, however, seen as a step further towards Education for Sustainable Development (ESD) of medicinal plant sellers. iv The study concludes by stating that issues of preservation and storage of medicinal plants by drying out in the sun, their packaging in plastic bags and reluctance to cultivate the plants by medicinal plants should be addressed by medicinal plant sellers. While the South African government is taking action to empower medicinal plant sellers about sustainability issues studies are required to engage communities to reflect and be actively involved in conservation of biodiversity such as medicinal plants through action research as means to sustain livelihoods of communities including medicinal plant sellers. In conclusion, the capacity building programme took place in a short time scale; based on the research findings the study makes recommendations to guide the education and sustainability of medicinal plants.
- ItemThe effect of activity-based instructional approaches in ameliorating alternative conceptions about electric circuits held by students from the national curriculum statement and the old school curriculum(University of Zululand, 2012) Rankhumise, Mmushetji Petrus; Imenda, S.N.Science students come to class with pre-instructional ideas that may influence the acquisition of science concepts. A basic assumption of the constructivist learning theory is that these pre-instructional ideas should be taken into account in constructing students' learning experiences in science classes. A number of conceptual change strategies have been studied in order to alter unscientific (also called alternative) conceptions towards the scientifically accepted conceptions. The challenging task of the science educator is to select appropriate teaching strategies and techniques that will enhance learning. This study investigated students’ alternative conceptions about electric circuits and the effect of activity-based instructional approaches in ameliorating these alternative conceptions. The approach took into account the prior beliefs of the students. A learning sequence was developed, presenting a variety of learning experiences in such a way and order that learners' alternative conceptions could progressively be changed into scientifically accepted ones. The sequence progressed from contextual to conceptual to formal activities. Co-operative learning, scientific enquiry, verbalisation and analogous reasoning techniques were used to guide learners in the acquisition of scientific concepts. The approach was based on the assertion that learners' scientific knowledge and understanding are socially constructed through talk, activity and interaction around meaningful problems and tools. vi The research population consisted of hundred (100) first-year science students enrolled at a South African university both from the NCS and the OSC (Nated 550). The test that served as pre- and post-test probed into learners' alternative conceptions about electric circuits. A theoretical framework, based on activity-theory as it is applied in a constructivist view of learning, was developed. A pre-post-test comparison group design was followed. In particular, the pre-test helped to identify alternative conceptions held by the students in the research sample. This was then followed by activity-based interventions within the pedagogical aegis of OBE with a view to alleviate the identified alternatives conceptions. These interventions were followed by a post-test in order to ascertain the effectiveness of the interventions in alleviating the identified alternative conceptions. Both quantitative and qualitative data were collected. From the quantitative data, using McNemar and “t” test, the findings showed highly statistically significant gains between the pre- and post-test scores of both the OBE and OSC groups (p < 0, 05), thus indicating the effectiveness of the intervention. The qualitative data showed that most of the alternative conceptions appeared to have been alleviated, No statistically significant difference was found between the normalised gains of OBE and OSC groups. Keywords: alternative conceptions, conceptual change, electric circuits, activity-based instructional approaches, teaching strategies, activity-theory
- ItemThe effect of isiZulu /English code switching as a medium of instruction on students' performance in and attitudes towards Biology(2008) Olugbara, Cecilia Temilola; Imenda, S.N.This study investigated the effect of IsiZulu/English code switching as a medium of instruction on Grade 10 students' performance and their attitudes towards biology. The increased failure rate of Black South African students in science subjects and the acute shortage of science personnel across many sciences-based professional affiliations were the motivations for the study. Four secondary schools in Esikhawini and KwaDlangezwa Townships in KwaZulu-Natal province of South Africa were randomly selected into experimental (IZECS) and comparison (EL) groups. Both quantitative and qualitative research approaches were used to collect data from these schools, in addition to a biology achievement test, a questionnaire and direct classroom observations. A pre-test and post-test non-equivalent comparison-group experimental design was used to measure the differences in the performance and attitudes of the students, following the IZECS and EL instructional interventions. The students were taught the human breathing system using IsiZulu/English code switching in the experimental and the English language only in the comparison group as the two independent variables. The dependent variables were the students' performance in biology and their attitudes towards the subject. Two hypotheses were formulated and tested at a= 0.05 level of significance. The t-test statistic was used to establish comparisons between the students' performance in biology and their attitudes towards biology between the two groups. The result of the comparisons showed a statistically significant difference between the two groups, in favour of the group that was taught using IsiZulu/English code switching on the performance in the post test. The attitudes of students in IsiZulu/English code switching group improved more favourably towards biology than those in the English language group following the interventions. The majority of the students that preferred IsiZulu/English code switching to other languages in both groups explained that the method would make biology easier to understand. Consequently, these students recommended that teachers should use IsiZulu/English code switching to teach biology for better understanding. They felt strongly that the adoption of IsiZulu/English code switching, as an instructional approach for teaching biology in Grade 10, would improve the students' performance and their attitudes towards the subject. Overall, the results from this study can be of use to teachers, educational planners and policy makers as they address the complex issue of language choice in South African classrooms.
- ItemPre-service science education students’ epistemological beliefs about the nature of science and science teaching and learning(University of Zululand, 2015) Ngwenya, Nkosinathi Hezekia; Imenda, S.N.This study set out to investigate beliefs held by pre service Bachelor of Education (B.Ed) students about the nature of science and science teaching and learning. The research sample comprised one hundred and eighty four (184) third and fourth year (B.Ed) students majoring in mathematics and physical sciences. Data on students’ epistemological beliefs about the nature of science and science teaching and Learning were collected using two questionnaires: The Nature of Science as Argument Questionnaire (NSAAQ) and Beliefs About Reformed Science Teaching and Learning (BARSTL). Furthermore the study sought to find out if those beliefs cohered with the beliefs espoused by the National Curriculum Statement (NCS) for Physical Sciences grades 10-12. The conceptual framework of this study was framed upon the preponderance of literature that carried the view that a teacher’s classroom practices are a consequence of two main dialectic influences: (a) the teacher’s epistemological beliefs about the nature of science, which may be either naïve or sophisticated; and (b) the teacher’s beliefs about teaching and learning, which may be either traditional or reformed. Accordingly, the conceptual framework guiding the study opined that teachers holding naïve beliefs about the nature of science, and those holding traditional notions of teaching and learning will be characterized by teacher-centred instructional approaches, while those holding sophisticated beliefs of the nature of science and a reformed view of teaching and learning will be associated with learner-centred instructional approaches. This study was a case study conducted at a South African university, and involved one hundred and eighty-four third and fourth year students registered for a four-year Bachelor of Education (B.Ed) degree for the Senior and Further Education and Training phase. During these two final years of the programme students are engaged in science enquiry practices in their Methods modules. The participants were registered in physical science and mathematics education. Intact groups were used, so there was no sampling undertaken to select participants. Data were collected by the use of (a) the Nature of Science as Argument Questionnaire (NSAAQ), to determine epistemological beliefs held by the participants about the nature of science, as well as the concurrence of those beliefs with the views about science teaching and learning espoused by the NCS; and (b) the Beliefs about Reformed Science Teaching and Learning (BARSTL) questionnaire, to determine the beliefs held by preservice education students about science teaching and learning. Data analysis involved the use of both descriptive statistical methods to decipher patterns and general trends regarding the epistemological beliefs about science held by participants, and their beliefs about science teaching and learning, as well as inferential statistics to test both a priori and a posteriori hypotheses. Similarly, statistical analysis was carried out to determine whether or not third- and fourth-year pre-service science education students held beliefs about science teaching and learning that were in agreement with the pedagogical content beliefs about science teaching and learning espoused by the NCS. The study found that pre service students held significantly more sophisticated epistemological beliefs about the nature of science at fourth year than at third year level. The results also showed that fourth year students demonstrated a significantly higher level of ‘reformed oriented teaching and learning beliefs’ about science than did the third year students. The results however showed that third and fourth year students held beliefs that were not in line with the beliefs espoused by the National Curriculum Statement (NCS). These results support studies which have found that student teachers become more sophisticated in their epistemological beliefs towards graduation. The findings also showed that the B.Ed programme is succeeding in developing both epistemological beliefs about the nature of science and teaching and learning. The degree to which the programme succeeded in developing these beliefs was however quite small. This study recommends that further investigations be done to determine whether students who hold sophisticated epistemological beliefs about the nature of science and ‘reformed beliefs about science teaching and learning’ also demonstrate superior science teaching skills
- ItemA study of factors contributing to underachievement in exponential and logarithmic functions in the Further Education and Training school phase(University of Zululand, 2019) Mohammad, Javed Khizer; Imenda, S.N.This study sought to determine the NSC learners’ level of understandings of exponential and logarithmic functions; grade twelve teachers’ self- assessment of their readiness to teach exponential and logarithmic functions; the relationship between the educators’ self-concept about their ability to teach exponential and logarithmic functions and the actual performance of their learners; and whether or not the educators’ MCK and PCK impacted learner achievement in exponential and logarithmic functions. The study developed a conceptual framework from literature which consisted of two major components depicting learner and educator readiness. These models illustrated factors that could possibly affect the ability of the learner to succeed in understanding instruction related to exponential equations and logarithmic functions, as well as those that would prevent educators from delivering optimum instruction to learners. This study used a mixed-methods research paradigm, as there was need to collect both quantitative and qualitative data in order to adequately answer the four research questions. The survey research design was used, and data were collected through a researcher-designed test (for learners) and a researcher-designed questionnaire for educators, focusing on their MCK and PCK. The research sample, consisting of nine school principals, nine mathematics educators, and 242 mathematics learners based in nine randomly selected schools, was drawn from a target population of high schools in the uMkhanyakude education district, KwaZulu-Natal Province, South Africa. Analysis was done using the SPSS version 23 software programme. The results revealed that learners had basic understanding of exponential and logarithmic functions in most aspects of the topic, although their performance was border line. For the educators, although all they were suitably qualified in terms of their minimum requirements for registration with the South African Council for Educators (SACE), their performance on the same test taken by their learners was only marginally above the performance of their learners. The educators’ responses to the question about their readiness to teach exponential equations and logarithmic functions were v mixed shedding some light on why many of them were unable to solve the same problems given to their learners. On the relationship between educators’ self-concept about their ability to teach exponential and logarithmic functions and their learners’ performance, the results showed that learners whose teachers considered themselves to be suitably qualified, knowledgeable and able to teach exponential and logarithmic functions performed significantly lower than learners whose teachers considered themselves not to be suitably qualified, knowledgeable and able to teach exponential and logarithmic functions. The results of the questions which sought to establish the impact of educators’ MCK and PCK on learner performance in exponential and logarithmic functions drew a blank, suggesting that there was no relationship between teachers’ MCK and PCK, on one hand, and learner performance, on another.