Although usually very predictable, the outcome of (inter) action on both the individual and the group level is in principle not predictable (undetermined, or chaotic). Mathematically, this is called nonlinear dynamics, or non-deterministic systems, or chaos. There are so many forces involved in the "system" as a whole and the interaction between these forces is very complex. Especially what does not matter to people in general, matters to us as individuals in particular. As individuals, we are not exactly identified but we are positioned!