The gradual reduction in size, a phenomenon associated with domesti­cation, and the occurrence o f wild progenitors in earlier levels, indicate that … - Jim G. Shaffer

Most prior interpretations attributed significant cultural developments, except early hunting-gathering adaptations, to external factors such as ethnic intrusions or invasions, diffusing ideas and technologies developed outside the region, usually in the West. Current information, however, suggests that these earlier, still persisting interpretations cannot explain the cultural complexities now found in the archaeological record.

Taken together, the above traits establish that despite significant differences, urban developments in the Indus-Sarasvatī and Ganges regions do belong to ‘a single Indo-Gangetic cultural tradition which can be traced for millennia’; in the words of Jim Shaffer, ‘a continuous series of cultural developments links the so-called two major phases of urbanization in South Asia’, the Harappan and the historical. His conclusion is plain: ‘the essential of Harappan identity persisted’.

Shaffer (1993) refers to one set of data that undermines this simplistic portrayal of an apparent devolution and re-evolution of urbanization, which "has nearly become a South Asian archaeological axiom" (55). Although there appears to have been a definite shift in settlements from the Indus Valley proper in late and Post-Harappan periods, there is a significant increase in the number of sites in Gujarat, and an "explosion" (300 percent increase) of new settlements in East Punjab to accommodate the transferal of the population.