Testing a disability question for the census

In the International Classification of Functioning, Disability and Health (ICF) 2001, the World Health Organization (WHO) defines disability as: ‘an umbrella term for impairments, activity limitations and participation restrictions. It denotes the negative aspects of the interaction between an individual (with a health condition) and that individual's contextual factors (environmental and personal factors)’, with environmental factors including assistance from other people, from equipment and from formal sources. WHO previously defined disability, in the context of health experience, as “any restriction or lack (resulting from impairment) of ability to perform an action in the manner or within the range considered normal for a human being” (World Health Organization, 1980, p. 28).