The dynamic trajectories of settlement growth are the phenomenon which we are actually studying rather than the static categories to which settlements are conventionally allocated. Because materiality is not an epiphenomenon of sociality, some combinations of materiality and sociality may work and others fail across a spectrum of possibilities. Trajectories can therefore have varied outcomes. And there are differing trajectories which settlements may follow across the Interaction-Communication matrix to higher or lower densities with increasing settlement size or to stabilisation. A myriad, possible outcomes are therefore amenable to being comprehended within the milieu of the Interaction-Communication matrix. The concept of entropy defines the field across which settlements move and the scaling effect describes the internal dynamic of those trajectories both at higher and lower densities. The implications for how we understand the options and the constraints inherent to the dynamic of settlements may be of some consequence for the way we comprehend the past and envisage the future.