The term lifestyle can denote the interests, opinions, behaviours, and behavioural orientations of an individual, group, or culture. The term was originally used by Austrian psychologist Alfred Adler (1870-1937). The term was introduced in the 1950s as a derivative of that of style in modernist art. The term refers to a combination of determining intangible or tangible factors. Tangible factors relate specifically to demographic variables, i.e. an individual's demographic profile, whereas intangible factors concern the psychological aspects of an individual such as personal values, preferences, and outlooks.