Final answer:
Structural therapy is suitable for the action or maintenance stages of change in the Transtheoretical Model, assisting individuals in modifying behavior or preventing relapse by reorganizing family structures.
Step-by-step explanation:
Structural therapy, a form of family therapy created by Salvador Minuchin, can be useful for patients in either the action or maintenance stage of change. These stages are part of the Transtheoretical Model of Behavior Change, which outlines a sequence of stages that individuals go through when changing behavior. In the action stage, individuals modify their behavior, experiences, or environment to overcome their problems. During the maintenance stage, they work to consolidate the gains they've made and prevent relapse. Structural therapy focuses on reorganizing the family system to support these changes in behavior, making it effective for patients actively working on change or those working to maintain their progress.