In this sense Stevenson's work is similar to that of ethnographers and cultural anthropologists. Participant observation is a method particularly employed by ethnographers in the anthropological tradition. He was "one of the foremost historians and early ethnographers of the medieval period". Many classical ethnographers recorded the sources of the idea of "shamanism" among Siberian peoples. None of these eastern peoples were considered Germanic by Roman ethnographers at the time. Cultural backwardness () was a term used by Soviet politicians and ethnographers. But these ethnographers also pointed out the superficiality of many such similarities. The Brahmana caste was further subdivided by these Dutch ethnographers into two&colon; Siwa and Buda. Other women in this school of early ethnographers include Zora Neale Hurston. The Wiradjuri were organised into bands or, what ethnographers traditionally called hordes. It was first recorded by ethnographers in the 18th century. A number of ethnographers note that this way was specific to the Ural River. Businesses, too, have found ethnographers helpful for understanding how people use products and services. Effectively, the idea of the image is a primary tool for ethnographers to collect data. Ethnographers also provide material about many other peoples.