Science teachers from secondary schools in Tanzania were offered an in-service arrangement to prepare them for the integration of technology in a studentcentered approach to science teaching. The in-service arrangement consisted of workshops in which educative curriculum materials were used to prepare teachers for student-centered education and for the use and application of Microcomputer Based Laboratories (MBL)-a specific technology application for facilitating experiments in science education. Quantitative and qualitative data were collected to study whether the in-service arrangement impacted teacher learning. Teacher learning was determined by three indicators: (1) the ability to conduct MBLsupported student centered science lessons, (2) teachers' reflection on those lessons and (3) students' perceptions of the classroom environment. The results of the research indicate that the teachers' were able to integrate MBL in their science lessons at an acceptable level and that they were able to create a classroom environment which was appreciated by their students as more investigative and open-ended.
This study investigated the extent to which teachers' questioning techniques and the way teachers handled students' responses facilitated students' learning and promoted their thinking skills. The study focused on three secondary schools in Dar es Salaam. The data collection process involved classroom observations during chemistry lessons and interviews of 10 chemistry teachers. The findings showed that 80% of the observed teachers had a moderate ability in using questioning techniques to measure students' understanding. The interesting observation in all schools was that teachers interacted frequently with active students and bothered less to involve the least active ones. Moreover, above 80% of all teachers had problems of promoting students' thinking by maintaining a balance between the openended and close-ended questions or between convergent and divergent questions. Also, the teachers indicated severe weaknesses in guiding classroom discussions through effective questioning as their abilities in probing were low. Thus, in-service program for these teachers may improve their classroom questioning behaviour.
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