The therapist is addressing grief, the IPT problem area focused on complicated bereavement following the death of a significant person

In this framework, the therapist facilitates mourning and helps the patient reconstruct interest in new relationships and activities. The patient's sense of loss and identity disruption following her child's departure parallels the grief process observed after a death, making this the appropriate IPT classification. Grief in IPT is specifically reserved for complicated bereavement following the actual death of a loved one. While the patient is experiencing a significant loss, her child has not died but rather moved away for college. IPT makes a clear distinction between grief (death) and role transitions (life changes). The empty nest experience, involving loss of a role rather than loss of a person to death, is classified as a role transition in IPT's framework.

The therapist is addressing an interpersonal dispute, the IPT problem area targeting conflicts between the patient and significant others where expectations are misaligned

The underlying conflict between the mother and her departing child about autonomy and closeness represents a nonreciprocal role expectation. The therapist's work to help the patient adjust expectations and develop new relational patterns reflects the dispute resolution framework. Interpersonal disputes in IPT involve active conflicts between two parties with differing expectations for the relationship, such as marital disagreements or workplace conflicts. The clinical vignette does not describe a conflict between the patient and her child but rather the patient's difficulty adjusting to a major life change. There is no indication of misaligned expectations or active disagreement. The loss of an established role with accompanying identity disruption is a role transition.

The therapist is addressing interpersonal deficits

The IPT problem area used when the patient has a history of impoverished or unfulfilling relationships and lacks the social skills necessary to initiate and maintain connections. The patient's social withdrawal and difficulty forming a new identity outside of motherhood reflect longstanding interpersonal inadequacy. Treatment focuses on building fundamental communication and relationship skills. Interpersonal deficits is the IPT problem area reserved for patients with long-standing patterns of social isolation or impoverished relationships, not for those experiencing depression in response to a specific life change. This patient had an active, fulfilling role as a mother and only became withdrawn after her child's departure.

The therapist is addressing a role transition

The IPT problem area activated when depression occurs in the context of a major life change that disrupts the patient's established sense of identity and social role. Treatment involves mourning the old role, recognizing both positive and negative aspects of the change, and developing mastery in the new role. The empty nest transition represents a prototypical role transition requiring adaptation to a fundamentally altered life structure. Role transition is one of IPT's four problem areas, specifically designed for depression that emerges when patients struggle to adapt to significant life changes such as retirement, divorce, relocation, or children leaving home.