Closure Criteria are the conditions under which the integrated relational field is considered closed: all participating units are coherently engaged and no further internal differentiation is induced.
Closure Criteria are defined by Mutual Form and Field Form: the twin structures that formalize both local inter-unit dynamics and global field architecture. The field achieves closure when every unit is engaged (none are isolated or unrelated) and the engagement itself does not force new distinctions (no further differentiation is induced).
This is a stronger condition than Closure (step 3), which was the self-maintenance of a single relational unit. Closure Criteria apply to the entire field of multiple units. The field is not merely self-sustaining — it is complete, in the sense that its internal dynamics have stabilized.