The idea of Frequency Lists comes from the Freelisting technique used in Cultural Consensus Analysis (Romney et. al. 1986; Borgatti 1992). The technique is designed to document categorical knowledge, usually among non-literate people whose folkways are little known outside their living group. For example, a researcher may wish to learn about the types of local foliage rural Haitian leaf doctors use to concoct herbal remedies. The researcher would ask a sample of leaf doctors to give the names of plants they use. The questions are typically asked of 20 to 30 respondents. Responses from the sample of respondents are then correlated.