History provides particularly interesting material for TOK discussions because of the challenges presented by not being able to directly observe the past

The human sciences include a diverse range of disciplines, such as psychology, social and cultural anthropology, economics, political science, and geography. These disciplines share a common focus on the study of human existence and behaviour .

Observation and experimentation play a key role, and terms such as “theory” have a special meaning in the natural sciences compared to how they are used in daily life and in other areas of knowledge 

The arts” is used in TOK to include a diverse range of discipline. The forms and methods of these disciplines are often dissimilar, so the diversity within this single area of knowledge.

Mathematics is sometimes seen to have a degree of certainty that is unmatched by other areas of knowledge or is seen to be founded on a set of more or less universally accepted definitions and basic assumptions.