as ‘equi-genetic’. Riggs explained the dilemma of change in the manner that the more exogenetic the process of diffraction, the more formalistic and heterogeneous its prismatic phase; the more endogenetic, the less formalistic and heterogeneous. Thus, greater the formalism, heterogeneity and overlapping, greater the state of ‘exo-prismatic’ and the lesser the ‘endo-prismatic’ character of change. Such a difference occurs because, with endogenetic change, ‘effective’ behaviour precedes the creation of new formal institutions, but in an