What is defined as a change where only behaviors or interactions within a system change?

The correct choice highlights the concept of first-order change, which refers to modifications that occur at the behavioral or interactional level within a system. This type of change is typically superficial and does not alter the underlying dynamics or beliefs of the system. For example, if family members begin to communicate more frequently or adjust specific behaviors without addressing the underlying beliefs or rules governing their interactions, this represents first-order change.

In contrast to first-order change, second-order change involves shifts in the system's structure and functioning, affecting the deeper dynamics and beliefs. Situational and developmental crises refer to different contexts or life transitions that challenge a system but do not specifically denote changes in behavior or interactions. Understanding these distinctions is vital for recognizing how interventions can impact relationships and systems in therapy.