Already in 1886, Stade suggested that the Hezekiah-Isaiah narrative is a composite literary creation. He detected literary seams and suggested a combination of three sources. Source A: A chronistic record (2 Kgs 18:14–16, which is absent in Isaiah). Two further independent traditions about the deliverance from the Assyrian threat have been combined into one story: (a) Source B1: 2 Kgs 18:13, 17–19:9a and (b) Source B2: 2 Kgs 19:9b–37. Most scholars have accepted the identification of two consecutive accounts with an almost similar development of the narrative. Some scholars suggested different reconstructions of the putative sources and distinguish up to six strands spanning for hundreds of years.

Recently, proponents of the synchronic literary approach analysed the Hezekiah-Sennacherib narrative (Isa 36–37/2 Kgs 18:13–19:37) as a coherent literary composition; some include the putative source A, while others exclude it. They are mainly focused on the message, meaning, devices of writing, and form and structure of the narrative as it stands in its final form.