frames of coordination
The frame of coordination is perhaps the most common type of relational responding. It incorporates the relation of identity, sameness, or similarity. This relational frame is probably the first to be abstracted sufficiently to enable its application to become arbitrary, in part because it is the only relation in which derived and trained relations are the same, regardless of the number of stimuli that participate in relational networks consisting purely of this response frame. Naming is an example of the frame of coordination at its simplest.