First of all the model reflects the three knowledge levels: individual, group and organizational knowledge level. On each of these levels various types of knowledge exist: implicit and explicit knowledge; knowledge in terms of property and knowledge in terms of meta-knowledge. Between these knowledge levels and within the individual and group level processes of knowledge sharing take place. In Figure 4, these processes are indicated by different arrows. Four different sub-processes as shown in Figure 3 can be found in every process of knowledge sharing. Not indicated in the model is that sharing knowledge in organizations is not isolated from the social environment. Interactions occur between different knowledge levels and the social context (e.g., Huysman & De Wit, 2000).