Capitalizing on the comments made by teachers on videos of exemplary science teaching, a video-based survey instrument on the topic of 'Density' was developed and used to investigate the conceptions of good science teaching held by 110 teachers and 4,024 year 7 students in Hong Kong. Six dimensions of good science teaching are identified from the 55-item questionnaire, namely, 'focussing on science learning', 'facilitating students' understanding', 'encouraging students' involvement', 'creating conducive environment', 'encouraging active experimentation' and 'preparing students for exam (PSE)'. Significant gaps between teachers' and students' conceptions on certain dimensions have been revealed. The inconsistency on the dimension 'PSE' is particularly evident and possible reasons for the phenomenon are suggested. This study raises the important questions of how the gap can be addressed, and who is to change in order to close the gaps. Answers to these questions have huge implications for teacher education and teacher professional development.
[Copyright of International Journal of Science Education is the property of Routledge. Full article may be available at the publisher's website:
http://dx.doi.org/10.1080/09500693.2011.629375]

Assessment is now identified as a powerful tool which can he used to influence the educational process positively. Underlying this view is a revolutionary shift in thinking of what assessment is about - from a 'testing' paradigm to a 'educational assessment' paradigm. The HKAL Biology Teacher Assessment Scheme (TAS) introduced in 1993 embodies such a shift in thinking. This paper draws on evidence from a naturalistic study of teachers' classroom practices in the TAS to illustrate that assessment innovation is certainly a necessary, but not a sufficient mechanism for changes within our educational system. It should be undertaken with full regard to problems of teacher interpretation and mediation at the classroom level. Otherwise, this will ruin the best intentions behind the assessment innovation.

This interpretive study of the implementation of a school-based assessment scheme of biology practical work in Hong Kong examines three teachers' struggles with the issue of fairness in relation to their classroom actions. Though the teachers' discourses were dominated by, and their classroom actions were pre-eminently influenced by, the notion of fairness, they did so in three qualitatively different ways: (1) fair in the sense of assessing students on a fair basis; (2) fair in the sense of not jeopardizing students' chances to learn the subject matter while they are being assessed; and (3) fair in the sense of not depriving students' of opportunities of receiving all-round education. The implication is that assessment innovation is a necessary, but not a sufficient, mechanism for changes within our educational system. The role of the teacher is challenged by the new assessment scheme—the co-existence of assessment and learning requires a significant change in the teacher's pedagogy. For teachers to implement the new programme their existing understanding and beliefs concerning assessment must be challenged and opportunities provided for them to come to terms with the philosophy of the new assessment scheme. Most importantly, the teachers themselves must undertake such a learning process.
[Copyright of International Journal of Science Education is the property of Routledge. Full article may be available at the publisher's website:
http://dx.doi.org/10.1080/09500690010017129]

Interviews with key scientists involved in research on severe acute respiratory syndrome (SARS), together with analysis of media reports and documentaries produced during and after the SARS epidemic, revealed many interesting aspects of nature of science (NOS) and authentic scientific inquiry. This novel insight into practice in the rapidly growing field of molecular biology was used in the development of instructional materials for use in the pre-service and in-service teacher education programme at The University of Hong Kong. The elements of NOS and scientific inquiry identified in the scientific research on SARS were explicitly emphasized in our instructional materials. The contemporary real-life context of SARS was found to be effective in promoting student-teachers' understanding of NOS and scientific inquiry, particularly in terms of: the realization of inseparable links between science and the social, cultural, and political environment; deeper understanding of how science and technology impact on each other; and a richer appreciation of the processes of authentic scientific inquiry and the humanistic character of scientists. The effectiveness is attributed to immediacy, relevance, and familiarity, making the abstract tangible, personal experience of science history, and the powerful affective impact of the interviews with scientists.
[Copyright of International Journal of Science Education is the property of Routledge. Full article may be available at the publisher's website:
http://dx.doi.org/10.1080/09500690701528808]

This paper reports findings about a curriculum innovation conducted at The University of Hong Kong. A CD‐ROM consisting of videos of two lessons by different teachers demonstrating exemplary science teaching was used to elicit conceptions of good science teaching of student‐teachers enrolled for the 1‐year Postgraduate Diploma in Education at several stages during the programme. It was found that the videos elicited student‐teachers' conceptions and had impact on those conceptions prior to the commencement of formal instruction. It has extended student‐teachers' awareness of alternative teaching methods and approaches not experienced in their own schooling, broadened their awareness of different classroom situations, provided proof of existence of good practices, and prompted them to reflect on their current preconceptions of good science teaching. In several ways, the videos acted as a catalyst in socializing the transition of student‐teachers from the role of student to the role of teacher.
[Copyright of International Journal of Science Education is the property of Routledge. Full article may be available at the publisher's website:
http://dx.doi.org/10.1080/09500690500239805 ]