Vernacular architecture is a term used to categorize methods of construction which use locally available resources to address local needs. Vernacular architecture tends to evolve over time to reflect the environmental, cultural and historical context in which it exists. It has often been dismissed as crude and unrefined, but also has proponents who highlight its importance in current design The building knowledge in vernacular architecture is often transported by local traditions and is thus based largely - but not only - upon knowledge achieved by trial and error and handed down through the generations, in contrast to the geometrical and physical calculations that underlie architecture planned by architects. This of course does not prevent architects from using vernacular architecture in their designs or from being firmly based in the vernacular architecture of their regions. Etymology and usage The term vernacular is derived from the Latin vernaculus, meaning "domestic, native, indigenous"; from verna, meaning "native slave" or "home-born slave". The word probably derives from an older Etruscan word.[2][3][4] In linguistics, vernacular refers to language use particular to a time, place or group. In architecture, it refers to that type of architecture which is indigenous to a specific time or place (not imported or copied from elsewhere). It is most often applied to residential buildings.[5] The term is not to be confused with so-called "traditional" architecture, though there are links between the two. Vernacular architecture may, over time, be adopted and refined into culturally accepted solutions, but only through repetition may it become "traditional." Traditional architecture can also include temples and palaces, for example, which normally would not be included under the rubric of "vernacular." The Encyclopedia of Vernacular Architecture of the World defines vernacular architecture as:[6] ...comprising the dwellings and all other buildings of the people. Related to their environmental contexts and available resources they are customarily owner- or community-built, utilizing traditional technologies. All forms of vernacular architecture are built to meet specific needs, accommodating the values, economies and ways of life of the cultures that produce them.