Transactive Memory is a concept of social psychology. This concept was developed by Daniel M. Wegner. It explains how people remember things in groups. Each member does not need to know (remember) everything. It is sufficient that one knows about someone else in the group who has knowledge of the matter. Simply said - I don’t need to know everything, it is sufficient that I know who knows.
In a group, organization, etc. there is thus created a Group Mind, which is a special type of memory system that is potentially much more efficient and more complex than the individual memories of group members. There are probably reflected principles of emergence and synergy.