The last few decades have seen a gradual shift in Isaianic studies as scholars have begun to give greater attention to the book's literary features rather than focusing predominantly on the question of its sources. Brittany Kim's study takes a literary approach, exploring how the book portrays Israel and its capital city using five metaphors that arise from the realm of household relationships: sons/children, daughter(s), mother, wife, and servant(s).
Drawing selectively on the resources of metaphor studies and rhetorical criticism, Kim examines each metaphor separately to determine its rhetorical import and, if possible, to trace its development throughout the book. From the beginning of Isaiah, in which Zion appears as a vulnerable but promiscuous daughter in need of both paternal protection and discipline, through the book's end, when her marital relationship has been restored and Zion has been transformed into a radiant and caring mother, Kim follows the thread of these five themes, showing ultimately how and why only those among yhwh's children who willingly take on the role of servant experience the joy and delight of Zion's maternal care.
Pulling together insights from individual studies, "Lengthen Your Tent-Cords" draws connections and highlights contrasts among the various metaphors. Kim concludes by examining how Israel and Zion fit into YHWH's royal household.