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In recent years, a number of curriculum reform projects have championed the notion of having students do science in ways that move beyond hands‐on work with authentic materials and methods, or developing a conceptual grasp of current theories. These reformers have argued that students should come to an understanding of science through doing the discipline and taking a high degree of agency over investigations from start to finish. This stance has occasionally been mocked by its critics as an attempt to create “little scientists”—a mission, it is implied, that is either romantic or without purpose. Here, we make the strong case for a practice‐based scientific literacy, arguing through three related empirical studies that taking the notion of “little scientists” seriously might be more productive in achieving current standards for scientific literacy than continuing to refine ideas and techniques based on the coverage of conceptual content. Study 1 is a classroom case study that illustrates how project‐based instruction can be carried out when teachers develop guidance and support strategies to bootstrap students' participation in forms of inquiry they are still in the process of mastering. Study 2 shows how sustained on‐line work with volunteer scientists appears to influence students' success in formulating credible scientific arguments in written project reports following an authentic genre. Study 3, using data from three suburban high school classes, suggests that involving students in the formulation of research questions and data analysis strategies results in better spontaneous use of empirical data collection and analysis strategies on a transfer task. The study also suggests that failing to involve students in the formulation of research can result in a loss of agency. The implications of these findings for future research and practice are discussed. © 2004 Wiley Periodicals, Inc. J Res Sci Teach 41: 234–266, 2004

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Increasingly, researchers in the learning sciences are appealing to notions of community to shape the design of learning technologies and curricular innovations. Many of these designs, including those in the area of project-based science, show strong promise; but, it is a challenging matter to understand the influences of these innovations in a detailed enough fashion to refine them over time. This work demands sensitive, theoretically grounded ways to assess the depth to which particular facets of innovations help enculturate students into communities of discourse and practice.Taking genre theory and the sociology of science as points of departure, I demonstrate a unique approach to the problems of developing and assessing students' understanding of persuasive practices in the scientific community. The research I discuss revolves around students' use of a professional scientific genre of scientific writing, the Research Article or Introduction, Methods, Results, Discission (IMRD) report (Swales, 1990), as they compose reports about their own original research. Using data from an innovative project-based high school science class, I demonstrate how genre use provides a window on the effectiveness of a learning environment in helping use discipline-specific tools of persuasion.In the classroom studied here, students developed e-mail mentoring relationships with volunteer scientists across the United States and Canada. Working in partnership with the teacher, these "telementors" served not only as inquiry guides for students, but also as a critical audience that helped shape the arguments they made about their research. Detailed analysis of the final reports produced by teams of students in the class revealed a significant relation between their fulfillment of the customary persuasive functions of a scientific research article and sustained correspondence with their telementors. A significant relation was also observed between sustained dialogue

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