In the 1970s, as a result of a fundamental revision of the readings of a large number of hieroglyphs by John David Hawkins, Anna Morpurgo Davies, and Günter Neumann, it became clear that both cuneiform and hieroglyphic texts recorded the same Luwian language. This revision resulted from a discovery outside the area of Luwian settlement, namely the annotations on Urartian pots, written in the Urartian language using the hieroglyphic Luwian script. The sign , which had hitherto been read as "ī" was shown to be being used to indicate the sound "za", which triggered a chain reaction resulting in an entirely new system of readings. Since that time, research has concentrated on better understanding the relationship between the two different forms of Luwian, in order to gain a clearer understanding of Luwian as a whole.