Waka Kala is one of the few sites which experienced depopulation during the Tiwanaku Period. Sector G has a population index value of 186 (3.5 ha), down from 246 for Sector F. This represents an annual growth rate of -0.04%. The nearby site of Alto Pukara (T-430) experienced an even more dramatic decline in population at this time, decreasing from 127 to 84, an annual growth rate of -0.06%. These two sites, very near to one another, fall into an intermediate zone between the administrative spheres of Sonaji (the Santa Rosa group) and the much larger and more important site of Lukurmata in the Pampa Koani. As mentioned briefly above in my discussion of Tilata (T-368), the settlement processes taking place on the Pampa Koani in the Tiwanaku Period seem to have been very different from those on the Taraco Peninsula. This difference can, I believe, account for the apparently anomalous decline in the population indices of these sites when compared to general population growth on the Taraco Peninsula at this time. I will take the up the matter again shortly.