What type of change is external, unplanned, and permanent?

Divorce is identified as an external, unplanned, and permanent type of change because it involves the dissolution of a marriage, which typically occurs due to factors outside the control of the individuals involved, such as personal conflicts or circumstances that arise over time. This change is not something that is usually anticipated or planned for, and once realized, it creates a permanent alteration in the family structure and personal relationships, affecting all parties involved, including children if present.

In contrast, job relocation and retirement, while significant life changes, are often more planned and can be initiated by individual choices or circumstances that do not necessarily carry the same level of permanence or impact on family dynamics. Change in family structure also encompasses various situations, but it can arise from a wider range of scenarios including but not limited to divorce, making it less specific than the direct implication of divorce as the sole event leading to a permanent change.