Disability is a complex multidimensional condition and poses a
number of challenges for measurement. Operational measures of
disability vary according to the purpose and application of the
data and the aspects of disability examined. Various sources can
be used to examine the prevalence of disability, but they are not
directly comparable because they use different approaches to
estimating and measuring disability. The definitional issues
underlie some of the difficulties in statistical analysis, and to
understand the conceptual questions shaping the efforts of those
working in the various fields relating to disability. Disability data
of Nepal is no exception, and researchers and organizations that
have been working for people with disabilities have questioned the
reliability of such data.