This article reports on the results of a planning grant studying the effects of a highly rated curriculum unit on a diverse student population. The treatment was introduced to 1500 eighth grade students in five middle schools selected for their ethnic, linguistic, and socioeconomic diversity. Students were given pre‐, post‐, and delayed posttests on a Conservation of Matter Assessment and measures of motivation and engagement. This quasi‐experiment found statistically significant posttest results for achievement, basic learning engagement, and goal orientation. Analyses of disaggregated data showed that subgroups of students in the treatment condition outscored their comparison group peers (n = 1500) in achievement in all cases, except for students currently enrolled in ESOL. Analysis of video data of a diverse group of four students as the unit was enacted suggests that students entered a learning environment that permitted them to function in different, but consistent ways over time; that is, the frequency of students' manipulation of objects showed a different pattern of engagement for each of the four students compared with patterns of verbal responses such as the use of scientific terms. The results of this planning grant paved the way for a large study of the scale‐up of highly rated curriculum units. © 2005 Wiley Periodicals, Inc. J Res Sci Teach 42: 912–946, 2005

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A mainstream narrative in the academy casts hidebound authority as the enemy of evidence and, in many cases, the truth. In this review, I argue for an ethnographic and linguistic approach to evidence and authority as communicative practices that are not inherently opposed but rather inseparably intertwined. For ethnographers, authority can usefully be viewed as authorizing acts (recognizing that the act includes the receiver), and evidence can be thus treated as a kind of authorization, an act of providing evidence. Viewed in this more dynamic framework, authority and evidence become observable practices in which actors deploy cultural forms-performances, experiments, verb tenses, quotes, narratives, pronouns-to persuade, argue, confirm, and mediate social and cultural relations.

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Indonesia's policy since independence has been to foster the national language. In some regions, local languages are still political rallying points, but their significance has diminished, and the rapid spread of Indonesian as the national language of political and religious authority has been described as the 'miracle of the developing world'. Among the Weyewa, on the island of Sumba, this shift has displaced a once vibrant tradition of ritual poetic speech, which until recently was an important source of authority, tradition, and identity. But it has also given rise to new and hybrid forms of poetic expression. This first study to analyse language change in relation to political marginality argues that political coercion or cognitive process of 'style reduction' may partially explain what has happened, but equally important in language shift is the role of linguistic ideologies.