This document discusses several models of knowledge management:
1. Von Krogh and Roos's organizational epistemology model distinguishes between individual and social knowledge. It identifies barriers to knowledge management.
2. Nonaka and Takeuchi's SECI model describes how tacit and explicit knowledge is created and shared through socialization, externalization, combination, and internalization.
3. Frid's KM model defines five levels of KM maturity from chaotic to knowledge-centric.