This is a book about knowledge and will considerthat which we do not explicitly know. It willexplain aspects of our everyday experience that mayappear inexplicable for, as Michael Polanyi wouldargue, a wholly explicit knowledge is unthinkable.It is an investigation and exploration into theimplications of the tacit component of knowledge.All knowledge has a tacit dimension which allows oneto move beyond the Cartesian paradigm inepistemology and provides a foundational structurefor understanding.In short, to know is to do.Tacit knowledge is comprised of practical andapplicable knowledge - the type of knowing that isbased on skills, a shared community of tradition andthe intersubjective relationship to the other. Thistext will also engage in a theoretical and practicaldialogue about the important roles that mentorshipand "elbow knowledge" play in all relationships,including the focal and subsidiary aspects of it. Byexamining specific practical actions it will becomeclear that tacit knowledge and skill must beinextricably linked together.