“An art which cannot be specific in detail cannot be transmitted by prescription, since no prescription for it exists… This restricts the range of diffusion to that of personal contact”.
– Polanyi
Cited in Polanyi’s Social Construction of Personal Knowledge and the Theories of Situated Learning. Frade, Cristina. UFMG. http://people.exeter.ac.uk/PErnest/pome17/pdf/polanyi.pdf