Appropriation (of knowledge) refers to the individualised process of constructing meaning out of socio-culturally defined knowledge and the essentially idiosyncratic structuring of the individual’s knowledge. Consequently, appropriation involves the development of increasing congruence between the body of external contextualised knowledge and the individual’s internal idiosyncratic organisation of that knowledge. Appropriation is differentiated by the individual’s interpretation of the physical and social context in which the individual thinks and acts.  It is this socio-cultural construction which provides the array of knowledge which forms and develops the cognitive structures.