Abstract. In this paper we explore how students talk and reason when they were exposed to a set of categories taken from scientific discourse. The scientific categories are built into a web-based discussion forum (Fle) as part of a pedagogical and technological design. The scientific categories are based on the concepts of the progressive inquiry model for knowledge building. Socio-cultural theory with a focus on concepts like categories and prompting is our theoretical framework. In the DoCTA NSS project we have used the progressive inquiry model to explore how the students use categories to collaboratively build new understanding of a specific knowledge domain. Based on the theoretical framework and an empirical example, we argue that the progressive inquiry model -in its conceptual form -is too rationalistic for student knowledge building. We found that student knowledge building is task-specific and local oriented, rather than aimed at conceptual artifacts.
INTRODUCTIONDesign experiments in different knowledge domains have been directed at how the learning environment could be designed to promote conceptual development beyond procedures and rules (Brown, 1992;Anderson, Holland, & Palincsar, 1997;Greeno & Goldman, 1998;Abbas et al, 2001). In many of these studies the authors have been able to show positive results, but they have also identified some shortcomings, such as fact-finding patterns (Hakkarainen & Palonen, 2002). An important finding is that students need to be prompted to articulate their conceptual understanding. The need for teacher intervention for creating conditions for the conceptual talk is also well documented (Hakkarainen, Lipponen & Järvelä, 2002).One important aspect of prompting that we explore in this paper is to use categories as "guiding principles" for the understanding-making process. Computer systems provide means for implementing such guiding principles, for example as different kinds of "sentence openers" built-into the ICT.Design experiments can be seen as an intervention in the educational practice; since the researchers in collaboration with teachers, try to change the way the students work. These shifts often presuppose a change in participation structures and how agency and division of labour are distributed between the teacher and the students. One aspect of this change is epistemological. By epistemological change we mean how the teachers and students think about the knowledge construction process. Their perception of this process has impact on what kind of participation structures will develop in the educational setting (Stenning, et al. in press; Hakkarainen, Lipponen and Järvelä, 2001).From a socio-cultural perspective on learning the notion of activity is seen as the basic concept for design and analysis. The participants in an activity are connected to each other by their involvement in talk and action with the teacher and their fellow students. The activity is mediated by the use of scaffolds inscribed in the computational environment. One scaffold we explore in t...