The limestone Kish tablet from the Late Uruk horizon is often cited among the earliest inscribed objects; its purely pictographic signs underscore how early Mesopotamian inscription could precede clearly readable language encoding.
In the Late Uruk period, the earliest proto-cuneiform tablets (notably from Uruk IV levels) document administrative accounting with pictographic signs and numerical notations—widely treated as the first stage of Mesopotamian writing.
The earliest proto-cuneiform system is primarily ideographic: signs are drawn as continuous lines (more pictorial), and the underlying spoken language is uncertain in the earliest phase—highlighting that writing began as administrative notation rather than full transcription of speech.
In the Uruk III / Jemdet Nasr phase, tablets show major graphic and organizational changes: strokes become shorter and more linear, sign forms more abstract, and writing conventions and tablet formats become more standardized—key steps toward later cuneiform practice.
A shift from more pictorial drawing toward impressions made with a blunter reed stylus contributes to the characteristic wedge-like strokes that gave cuneiform its later name and visual identity.
With the start of the Early Dynastic period, the script transitions from proto-cuneiform toward a more standardized cuneiform system suitable for broader administration and, increasingly, for representing language (not only commodities and numbers).
By the early 3rd millennium BCE, some tablets begin using signs for their phonetic (syllabic) values—an important breakthrough that makes it possible to write personal names, grammatical elements, and more abstract language content.
As phonetic use expands, the script trends toward a logosyllabic system (mixing logograms and syllabic signs), while the sign inventory is reduced substantially from the very large archaic repertoire—supporting more consistent reading and teaching.
During the Early Dynastic period, cuneiform usage broadens from administrative accounts to include legal and institutional texts; this expansion reflects growing scribal specialization and the script’s increasing capacity to record complex social relations.
By the mid–3rd millennium BCE, cuneiform is used to record sustained Sumerian literary compositions. Texts such as the Instructions of Shuruppak and the Kesh temple hymn are among the oldest surviving literary works written in Sumerian cuneiform.
Early Dynastic IIIa (often associated with the “Fara” script tradition) preserves a large archaic sign repertoire later cataloged by scholars (e.g., Deimel’s Liste der archaischen Keilschriftzeichen), illustrating the bridge between earlier diversity and later standardization.
By the Ur III period, cuneiform conventions are highly systematized in state administration and education; major compositions (including the oldest copies of the Sumerian King List tradition) are preserved in standardized scribal forms typical of mature cuneiform practice.
Michael CarricoProto-cuneiform to Standard Cuneiform: Development of Sumerian Writing (c. 3400–2000 BCE)