This is the second part of the paper in which fusion is considered as one of the fundamental mechanisms of mental functioning, an essential element in every object relation - with variations only in the degree of participation - along with the component connoted by separateness. There is a continuous dialectic relationship between levels of fusion and separateness. Human beings are characterized by an extremely sophisticated and continuously changing boundary system.

This part of the paper focuses on some aspects of the role of fusion within the psychoanalytic relation, the mother child matrix, the group mental activity and the meta-ego dimension.