Inferring a common need, being motivated to act cooperatively to fulfill this need, coordinating individuals' roles and perspectives under the common goal of fulfilling this common need if, and only if other agent fulfill his commitment toward that goal, and sharing the spoils fairly ; thus can be defined the overall scheme of the sharing of attention and of intention. Tomasello holds such dual structure of commonality and individuality as being a cognitive integration of skills in mind reading, in instrumental action and in simulational thinking (meaning agents use an internal representation of the state of things, and simulate actions and outcomes of these actions). Individuals need to make clear or explicit, by eye contact, by gestural pantomime or else, that they intend to coordinate their actions and perspectives under a common goal. Communicating such a specific intent suggest agents can entertain a sense of forming a "we", to which they feel a sense of commitment, such that defecting from collaborating require an apology or a taking leave. Collaborative agents also see their interaction through a representational format amounting to a bird's eye view or view from nowhere, as suggested by their skills at role switching with their partner, and at inferring what is helpful or relevant to help their partner play their role.