This study sought to identify how teachers of science in English medium secondary schools in Hong Kong make science content accessible to students through English, the students second language. The strong emphasis on language outcomes in much of the research on late immersion (of which English medium education in Hong Kong is considered an example) indicates that a study which addresses classroom processes may be timely.
The significance of language in immersion education suggested that an awareness by teachers of the part language plays in learning within the curriculum might provide a means by which qualitative differences in the teaching of content could be identified. The study, therefore, attempted to determine whether there are any differences between teachers who are strongly aware of the role of language in learning and those who are weakly aware in the ways they integrate language and content in their teaching to facilitate student learning. Further, it explored how those differences are realised.
A qualitative approach was adopted for the study. A theoretical framework was developed with which to analyse classroom data on the teaching of science through English. The framework was made up of six dimensions describing the integrated teaching of science and the English of science in an immersion context. It was developed from the literature and was further refined as a result of intensive reading and re-reading of lesson transcripts.
Six teachers of science were studied. A questionnaire was used to place each teacher on a language awareness continuum and four were thus classified as strongly language aware and two as weakly language aware. The teachers were observed and recorded teaching the same science topic. Following the lessons, the students were given a test of science which required that they express their understanding in written English. The teachers and some students were also interviewed.
The science test results revealed that students

The study examined knowledge building and scientific understanding in the context of high school students working collaboratively on Knowledge Forum in a chemistry classroom in Hong Kong. Three specific questions were explored: 1) How can knowledge building be assessed and characterized? 2) What are the roles of knowledge building in scientific understanding? and 3) How does the community develop and how do teacher and contextual factors influence its growth and evolution? Participants included 34 Secondary Four students (Grade 10) who worked on knowledge building pedagogy mediated by a computer supported platform called Knowledge Forum for eight months. Various data including Analytic Toolkit statistics (ATK), depth of inquiry, learning portfolios and examination results were examined. Students' Knowledge Forum discourse was also analyzed quantitatively and qualitatively. The findings show that 1) a three-pronged approach using ATK, depth of inquiry, and discourse analysis was a suitable tool for tracing both individual and communal growths in knowledge work, 2) knowledge building learning portfolio and the ATK index "linked notes" predicted students' conceptual understanding, and significant differences in students' school examination, a measure of their scientific understanding, were obtained favoring Knowledge Forum students over comparison counterparts, and 3) three distinctive phases were identified suggesting students' growth in epistemic agency; as well as showing how the growth of the community was mediated by contextual and teacher factors. Discourse analysis suggests how knowledge building might be a useful means of promoting scientific understanding at both individual and communal levels interweaving progress in conceptual understanding with growth in views and ways of doing science, thus helping students to move towards both "science learning" and "learning about science". Theoretical and pedagogical significances of the findings and the limitations of this