Constructive collaboration can be a difficult matter. For this reason, we are implementing and studying an interactive-tabletop-mediated activity that aims at inducing collaboration among participants. The resulting activity 'Orbitia' is designed as a serious game. Participants are asked to act as a spacemining crew, which has to collect minerals with a rover and rely on a cameradrone for reconnaissance, while keeping the rover out of harm and managing limited resources. In this paper we provide an account of how we designed Orbitia's pedagogical structuring by relying on the Johnsons' cooperative learning approach whose fundamental concept is "positive interdependence". More particularly, we show how we worked on resource, role and task interdependence to design three collaboration-inducing 'flagship' devices: the roversteering-device (RSD), the item-locating-device (ILD) and the responsibilityactivating-device (RAD).

This paper discusses theoretical and methodological issues arising from a video-based research design and the emergent tool 'Joint Screen' when grasping joint activity. We share our reflections regarding the combined reading of four synchronised camera perspectives combined in one screen. By these means we reconstruct and analyse multimodal moment-to-moment interaction between young peers engaged in an open-ended baking activity. We rely on a fine-grained analysis of three multimodally transcribed video extracts to highlight how a combined viewing of multiple joint camera perspectives provides access to how participants do joint activity through the simultaneous and continuous use of embodied resources. We argue that 'Joint Screen' generates an 'expanded-around' view that allows the capture of multimodal interactional processes in their phenomenal depth in time and space.

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Our paper provides an empirically based perspective on the contribution of Conversation Analysis (CA) to our understanding of children's second language learning practices in a multilingual classroom setting. While exploring the interactional configuration of a French second language learning activity, we focus our analytic lens on how five children and their teacher rely on multilingual resources (French, German, Luxemburgish, and Portuguese) in order to initiate and to improve the re-voicing of a story in French. Through a moment-bymoment (CA) video based analysis we can show how co-constructing the second language learning object involves various embedded linguistic and interactional competencies. We will point out how the participants engage in the re-voicing activity through their mutual orientation to each other's language conduct. Effective second language learning becomes possible because the teacher's student-directed talk provides opportunities for the children to provide oral narratives in a jointly constituted multilingually shaped interaction. Moreover, by offering insights into the interactional features (turn-taking system), CA allows us to visualize how the children's second language learning practices are interrelated with the sequential structure of multilingual talk-in-interaction. Thus, in our case study we emphasize the fundamentally social nature of second language classroom talk. 1 We do not pretend to provide an exhaustive overview of CA based research on second language learning; we shall only draw together some common threads that advocate CA to investigate language learning activities.

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