After 2500 BC, cuneiform, which was the Sumerian script, became a complicated system because it constituted of ideograms and phonetic signs mixed together. The resultant system of syllabus enhanced the modeling of writing to speech. In that regard, the second phase of the progression of cuneiform, which was characterized primarily by phonetic signs creation, caused writing to part ways with accounting, as well as cuneiform spreading out beyond Sumer to be used in the neighboring regions. The transcription of personal names using phonetic signs played an instrumental part in creating a channel for spreading beyond Mesopotamian borders, which is why Egyptian scripts were instantaneously phonetic and why Egyptians never adopted Sumerian signs.
