Views of South African Chemistry Students in University Bridging Programs on the Reliability of Experimental Data

This paper reports an investigation of the status of procedural knowledge in chemistry amongst students entering into bridging programs at two South African universities. The students answered a questionnaire which investigated their perceived reasons for repeating readings and their ideas about handling data. Students also answered a question on laboratory apparatus which was used to assess their laboratory experience. The overall responses were analysed, as well as their relationship to laboratory experience and home language. The findings show that students overall tend to repeat in order to get a recurring reading. Very few students were able to use a line of best fit for a set of graphical data. There is some relationship between their responses and previous laboratory experiences, but little fundamental difference between the responses of the two main language groups. Some implications for tertiary education in chemistry are discussed.     

Unawareness to Production,Dropout to Innovator—Primary teachers' understanding and use of a science,technology and society approach to science teaching

This paper investigates the process of teacher change in a group of 8 primary school teachers during their exposure to a science, technology and society (STS) approach to teaching Science in Swaziland. The research aimed to establish the effect of support given to teachers in using the approach through a series of workshops, followed by a 5-week supported implementation of the unit ‘matter and energy’. An analysis of the way in which the STS approach impacted on the classroom practice of the teachers yielded 2 outcomes that were hierarchical. First, teacher understanding of the approach was observed to go through levels of unawareness, recognition of differences in approach, utilisation, personalisation and production. Second, the teachers' level of use of the STS approach was observed to have been affected by their levels of understanding, characterised by the following typologies: dropouts, strugglers, domesticators, succeeders and innovators. Some relationship between levels of understanding and typology of use was found, however, the level of understanding was not the exclusive determinant of typology of use. Only teachers reaching the utilisation level were able to use the innovation in a sustainable way, while those at the level of unawareness were able to become domesticators, adapting the innovation to their usual teaching approach.     

What do Underprepared Students Learn about Measurement from Introductory Laboratory Work?

This study investigates changes in students' understanding of various aspects of measurement before and after participating in two different introductory laboratory courses at two universities in South Africa. Students' ideas were sought using a probe into their understanding of data collection, data processing and data comparison. The responses were analysed using a model which identified subjects as adhering to either a point or set paradigm. Considerable gains were made during instruction with both groups, though some important differences were identified between them. Neither group could be identified after instruction as full adherents to the set paradigm which was a goal of the instruction. Rather, the majority were found to use ad hoc or rote set action, while using point reasoning.