Consider a document, CAD drawing, a process flow chart, a poem, a sculpture. The nature of the representation imposes constraints on interpretation, and there is little or no way to capture feedback from the reader or viewer. New knowledge emerges when there is a social process related to static objects. There is feedback, cognitive processing by individuals, and the creation of shared meaning within the group. Knowledge must be explicit to be useful.
All knowledge is tacit.
Once we make our individual knowledge explicit, it becomes information. Knowledge can only be shared, stored and distributed in the explicit form. Knowledge has value only when it is used. If you learn something but never deliver there is no knowledge exchanged. Knowledge that stagnates declines in relevance and worth.