It is not easy to make a simple appeal to the Andronovo culture to resolve all the issues of Indo-Iranian origins... When the archaeological evidence… - James Patrick Mallory

While a good case can be made for an expansion of Pontic-Caspian pastoralists onto the Asiatic steppe, and perhaps also into the belt of central Asian urban centres (Parpola 1988), it is still difficult to demonstrate movements from the steppe into the historical seats of the Indo-Aryans and the Iranians of Iran itself.

The problem here, of course, is that over time we have come to know more and more and that our earlier, simpler and more alluring narratives of Indo-European origins and dispersals are all falling victim to our increasing knowledge. We have obviously moved on from the time when Nikolai Merpert first published his analyses of the role of the steppelands within the context of the Indo-European homeland but it is evident that we still have a very long way to go.

In any event, all three models [Anatolian Neolithic, Near Eastern, Pontic-Caspian] require some form of major language shift despite there being no credible archaeological evidence to demonstrate, through elite dominance or any other mechanism, the type of language shift required to explain, for example, the arrival and dominance of the Indo-Aryans in India.