 According to Giddens, structure is both constituted by human agency and is the medium in which human action takes place (Giddens 1976, p. 121). This seems to mean, firstly, that structure is nothing other than the repetition over time of the related actions of many institutional actors. So the structure consists of: (i) the habitual actions of each institutional agent; (ii) the set of such agents; and (iii) the relationship of interdependence between the actions of any one agent and the actions of the other agents. But it means, secondly, that this repetition over time of the related actions of many agents provides not just the context, but the framework, within which the action of a single agent at a particular spatio-temporal point is performed. Structure qua framework constrains any given agent’s action at a particular spatio-temporal point. (In addition, and as Giddens is at pains to point out, structure qua framework enables various actions not otherwise possible, e.g. linguistic structure enables speech acts to be performed.)