This article traces the historical and conceptual development of what is known as activity theory, from Vygotsky and Luria, to A. N. Leont’ev, to Engeström, in order to illustrate what I see as two problems with the activity theoretic approach, especially as manifest in the work of Leont’ev and Engeström: what I call the boundary and/or focus problem and the unit-of-analysis problem. In the second half of the article, I explore the social semiotic of an everyday artifact, the “speed bump,” and introduce a discovery heuristic for examining how this artifact functions mediationally in human activity. In so doing, I have tried to discover activity through principled analysis, rather than assuming activity or activity system a priori.

This article is concerned with characterizing literacy activity as it is practiced in professional workplaces. Its starting point is activity theory, which grew out of the work of Vygotsky and has been subsequently elaborated in Russia and elsewhere. First, the authors propose that existing versions of activity theory are unable to account adequately for practical human activity in contemporary workplaces, and present a revised perspective that opens the way for new theoretical developments. Second, they elaborate two new constructs, task and work ensemble, and apply them to a short collaborative writing sequence collected in the field. Both constructs are seen to account in a substantive way for the structure of the composing activity carried out by the collaborators. They close with a discussion of the complementarity and theoretical advantages of the two constructs.

This article explores the role of embodied knowledge and embodied representation in the joint revision of a small section of a large technical document by personnel from two organizations: a city government and a consulting engineering firm. The article points to differences between the knowledge and the representation practices of personnel from the two organizations as manifested in their words and gestures during the revision task, and it points to the gestures of the city personnel as a principal means by which their greater embodied knowledge of channel easements becomes distributed across the group as a whole. The article concludes by pointing to some advantages of considering acts of writing as embodied practices and by indicating a number of related questions that should be pursued in subsequent investigations of literacy in modern workplaces.

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