Thesis (MEd)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: This research study investigated the use of a practical activities-based approach to Physical Sciences teaching using TRAC equipment to address learner conceptual difficulties in Electricity and Magnetism (E&M). TRAC uses practical activities based on the school curriculum to complement the theory through the utilisation of data logging equipment linked to a computer. The participants in this study were a group of black Grade 11 learners (n=47) from a township school in the province of the Western Cape, South Africa. Their ages range from 16 to 21, with isiXhosa the home language of most of them. A mixed methods approach was utilized to gather the research data. Quantitative data was collected, using pre- and post-testing of learners to determine their conceptual difficulties in E&M, as well as to measure the effect of the practical activities-based approach in addressing learner conceptual difficulties in E&M. Null hypotheses were formulated for the six concepts and t-tests were used to find any statistically significant difference between the pre- and post-test. Qualitative data was obtained from the learner transcripts, as well as from the questionnaires and observation schedules. The results indicated significant improvements in learner understanding of the concepts in five out of the six tests as well as reducing commonly held misconceptions in E&M. It is recommended that careful scaffolding should be done during a practical activity in order for learners to make the connection between the domains of observables and ideas. / AFRIKAANSE OPSOMMING: Hierdie navorsingstudie het die gebruik van ‘n praktiese aktiwiteitsgebaseerde benadering tot Fisiese Wetenskappe onderrig met behulp van TRAC apparaat ondersoek. Die doel was om leerders se konseptuele haakplekke in Elektrisiteit en Magnitisme (E&M) aan te spreek. TRAC maak gebruik van ‘data logging’ apparaat om die teorie deur middel van praktiese aktiwiteite wat op die skoolkurriulum gebaseer is, te komplementeer. Die deelnemers in die studie was ‘n groep swart Graad-11 leerders (n=47) uit ‘n swart woongebied in die Westelike Provinsie, Suid Afrika. Hulle ouderdomme strek van 16 tot 21 met isiXhosa as die huistaal vir die meerderheid van hulle. ‘n Gemengde metode benadering was gebruik om die navorsingsdata te versamel. Kwantitatiewe data was deur ‘n voor- en natoets van die leerders versamel om hulle konseptuele haakplekke in E&M te bepaal. Die effek van die praktiese aktiwiteitsgebaseerde benadering om die leerders se konseptuele haakplekke in E&M aan te spreek was ook gemeet. Nul hipotese was vir die ses konsepte geformuleer en t-toetse was gebruik om statisties-beduidende verskille tussen die voor- en natoets te bepaal. Kwalitatiewe data was van die leerders se oorgeskryfde onderhoude sowel as vraelyste en observasieskedules verkry. Die resultate toon ‘n beduidende verbetering in leerders se begrip van die konsepte in vyf van die ses toetse sowel as ‘n afname in algemene wanbegrippe in E&M. Dit word aanbeveel dat versigtige opbouing gedurende die praktiese aktiwiteit gedoen moet word sodat die leerders ‘n verband tussen die domein van waarneembares en idees kan maak.

The purpose of the study was to investigate grade 11 learners’ problem solving skills and conceptual reasoning on concepts in stoichiometry. Two theoretical frameworks were used in this study namely, cognitive load theory (CLT) and typology of curriculum representation (levels of curriculum alignment). The explanatory sequential mixed method research design were applied where 410 physical sciences learners in their intact classes and eleven of their teachers participated in the study. The participants completed purposefully designed research instruments consisting of an achievement test (LAT), a teacher and a learner questionnaire (TSQ and LCQ), and a teacher lesson plan on stoichiometry-related concepts (TLP). Other instruments used include a semi-structured interview schedule (LIS), classroom observation schedule (COS) and learner work books (LWB). The study was underpinned by five research questions. Pearson correlations showed that the justifications given by learners for choosing right or wrong objective options were not due to chance and suggested a learner choosing the right objective option has the right conceptual reasoning. Findings indicate that there is a positive correlation between problem-solving skills and conceptual reasoning where conceptual reasoning statistically predicted learners’ problem-solving skills using Regression. Problem solving is an important cognitive activity in everyday and professional contexts. Therefore, it requires teachers to know where to focus their teaching and how to assess learners’ work to avoid unnecessary overloading of the working memory of learners which might affect their performance. Conceptual reasoning and problem-solving errors were made during the problem solving, for example, learners could not apply mole ratio, they were unable to do change of subject and they interchanged the meanings of chemical terms such as mole, molecule, atoms and mass. In terms of possible reasons for the errors, and how it linked to the way learners were taught, the curriculum levels were considered. Findings indicate that there is a mismatch between what is expected in stoichiometry from the CAPS curriculum termed intended curriculum and the implemented curriculum which includes teacher lesson plans, classroom observations and learner workbooks. The classroom observations schedule was designed in line with the teacher lesson plan. There were topics planned in the lessons that were not found in the learner workbooks. The analysis of the content of learners’ workbooks for topics treated under stoichiometry, revealed that 75.7% of concepts were being taught while 24.3% were not. The analysis showed that learners experienced difficulties with calculating the concept of limiting reactant. There is a mismatch between implemented and attained curriculum as well. In the TSQ, teachers indicated that the errors were due to misconceptions, misunderstanding, carelessness and misinterpretation. These were found during marking of the learner achievement test. In conclusion, this study did not find a direct link between the way the learners were taught and the errors they committed during problem solving based on the implemented (TLP, LWB and COS) and attained curriculum (LAT, LCQ, LIS and DoBE report) / Science and Technology Education / Ph. D. (Mathematics, Science and Technology Education)