The central motivation for assembling the contributions in this Handbook on the Knowledge Economy derives from the observation that many in government and business seem to have taken up the challenge of putting in place whatever is needed for a knowledge-based economy or a knowledge-based organization but very few appear to be inclined to explain what knowledge is or how it works socially, organizationally or economically. While there are good reasons for this situation, not knowing what knowledge is or how it works in any detail is problematic for those who are charged with managing or facilitating it. Policymakers would not consider constructing monetary policy without the input of some detailed knowledge of economics. Managers would not implement an information system without detailed input from knowledgeable information systems experts. Similarly, good knowledge of knowledge should be seen as essential for knowledge management and knowledge- related policy.