Graphic image presenting two triangular schematic models used in activity theory to represent relationships within human activity systems. At left is single large equilateral triangle subdivided by internal diagonals connecting vertices, forming network of intersecting relationships. Upper vertex is labeled “Mediating Artifacts, Tools and Signs,” lower left vertex labeled “Rules,” lower right labeled “Division of Labour,” and central lower vertex labeled “Community.” Midpoint along left slanted edge is marked “Subject,” right slanted edge midpoint is “Object,” and circle adjoining right edge is labeled “Sense/Outcome → Meaning.” Diagonal and horizontal lines interconnect all points, creating internal hexagonal web structure. Caption beneath identifies this as “The Structure of a Human Activity System.”

Right side of diagram shows pair of interconnected triangular models, representing “Two Interacting Activity Systems as Minimal Model for 3rd Generation Activity Theory.” Each triangle mirrors structure of the first, with equivalent labeled vertices: “Mediating Artifacts,” “Rules,” “Community,” “Division of Labour,” “Subject,” and “Object.” Between two objects of adjacent triangles lies overlapping oval region shaded grey, labeled “Object 1,” “Object 2,” and “Object 3,” representing evolving shared object in interacting systems. Lines within triangles mirror those of left model, producing complex network indicating interaction between components of distinct but interconnected activity systems.

Graphic is drawn with thin black lines for structure, white background for clarity, and small yellow circles highlighting nodes labeled “Object.” Visual arrangement emphasizes systematic relationships rather than aesthetic detail, functioning as theoretical diagram for socio-cultural activity theory, showing mediation, community roles, division of labor, and shared evolving object of collaboration.