Ikujiro Nonaka considers two dimensions for knowledge creation, the epistemological dimension, and the ontological dimension. The epistemological dimension converses tacit knowledge to explicit knowledge and vice versa, and ontological dimension emphasis the conversion of knowledge from individuals to groups and organizations.

the SECI Model of Knowledge Dimensions assumes that knowledge is created by a conversion between tacit- and explicit knowledge

Socialization
Externalization
Combination
Internalization

Socialization
At this level, knowledge is converted from tacit to tacit. Knowledge is moreover transferred through practice, guidance, and observation but knowledge is many times obtained through a dialogue.

Externalization

suppose it could be codified, tacit knowledge is specified in words and put into manuals or other documents so that it can easily be shared among members in the organization.

Combination is the process of systematizing concepts into a knowledge system. At this level, knowledge is converted from explicit to explicit. This means that existing sources such as books, documents, memos are used and combined to create new knowledge such as a report for example.

Internalization occurs when individuals read and write about what they experience. This process is additionally realized when organization share explicit documents so that employees can learn through reading and eventually by doing.