Figure 1 Structure of a human activity system (Engestrom Citation2001, 135).
Figure 2 Characteristics of classroom practice at each level.
Figure 3 Activity system in changing classrooms.
Figure 4 A lesson description for a class in which practice had reached Level 3.
Figure 5 An example of how regulatory processes interact.
Figure 6 Activity system in changing classrooms showing major contradictions.
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