The process of coming to know relates to practical knowledge and the applications of knowledge. Ryle (1949) established that practical knowledge (‘knowing how’) belongs to epistemology as well as declarative knowledge (‘knowing that’). Sneed (1971) proposes a model of scientific knowledge which incorporates the range of intended applications (models) as well as the core theory. The model has been extended to mathematics by Jahnke (Steiner,1987). Such approaches admitting practical knowledge or its applications into the traditional domain of knowledge thus parallel aspects of the social constructivist proposals.