ABSTRACT
The depiction of a collective action category system below is written to satisfy several requisites. It is first necessary to describe the difference between individual action and collective action and how collective action categories are likely to derive from individual or inter-individual action categories. An accessory requisite that also takes into account the imperfection of collective procedures would be to show that any understanding of collective action requiring building, based on first degree individual representations, an infinite superstructure of crossed representations with ever-increasing levels is neither realistic nor feasible. Having defined the levels of action interpretation procedures, and the levels of collective action, need to define the degrees of items related to actions. Items are indeed essential to enabling to interpret action types. The chapter tries to justify the distinctions of common sense between natural items, artificial items, conventional items and personnel items, even if only use three modes of items, common items, conventionalised items and personalised items.
