According to Malcolm Todd, traditional archaeology has not been able to construct a typology of Bastarnae material culture, and thus to ascribe particular archaeological sites to the Bastarnae. A complicating factor is that the regions where Bastarnae are attested contained a patchwork of peoples and cultures (Sarmatians, Scythians, Dacians, Thracians, Celts, Germans and others), some sedentary, some nomadic. In any event, post-1960s archaeological theory has questioned the validity of equating material "cultures", as defined by archaeologists, with distinct ethnic groups. In this view, it is impossible to attribute a "culture" to a particular ethnic group: it is likely that the material cultures discerned in the region belonged to several, if not all, of the groups inhabiting it. These cultures probably represent relatively large-scale socio-economic interactions between disparate communities of the broad region, possibly including mutually antagonistic groups.