 Thus, two familiar features are shared by most official definitions of disability, such as those in the World Health Organization (1980, 2001), the Disability Discrimination Act (UK), and the Americans with Disabilities Act (United States): (i) a physical or mental characteristic labeled or perceived as an impairment or dysfunction and (ii) some personal or social limitation associated with that impairment. Impairments are generally seen as traits of the individual that he or she cannot readily alter. Just what makes a condition a trait or attribute of an individual is obscure and debatable, but there seems to be agreement on clear cases. Thus, poverty is not seen as an impairment, however disabling it may be, nor is tasteless clothing, even if it is a manifestation of impaired fashion-sense rather than scarce income. On the other hand, diseases are generally classified as impairments, even though they are often neither permanent nor static conditions. Diseases that are especially transient, however, such as the flu and the measles, do not normally count as impairments.