be developed in the Near East. The texts of this period are mostly of an administrative type and are found principally in contexts that seem to be public (palaces or temples), rather than private. But the texts of Uruk, which constitute the majority of the total corpus for this period, were discovered in a trash heap rather than in the context in which they were produced and used; this makes it difficult to identify them. Their interpretation is equally problematic, on account of their archaic character. The writing is not yet cuneiform, but is linear. These texts were misunderstood by their first publisher in the 1930s, Adam Falkenstein, and it was only through the work of the German researchers Hans Nissen, Peter Damerow and Robert Englund over the following 20 years that substantial progress was made. Alongside the administrative texts, were discovered from the beginning of writing, some literary texts, the lexical lists, lexicographic works of a scholarly type, which compile signs according to different themes (lists of crafts, metals, pots, cereals, toponyms, etc.) and are characteristic of Mesopotamian civilization. A remarkable example is a List of Professions (ancestor of the series Lú.A, which is known from the 3rd millennium BC), in which various different types of craftsmen are listed (potters, weavers, carpenters, etc.), indicating the numerous types of specialist workers in late Uruk. The causes and course of the origins of writing are disputed. The dominant theory has them derive from more ancient accounting practices, notably those of the calculi mentioned above. In the model developed by Denise Schmandt-Besserat, the tokens were first reported on the clay envelopes, then on clay tablets and this led to the creation of the first written signs, which were pictograms, drawings which represent a physical object (logograms, one sign = one word). But this is very contested because there is no obvious correspondence between the tokens and the pictograms that replaced them. In general, a first development (occurring around 3300–3100 BC) is however retained as being based on accounting and management practices, and has been explored in more detailed by H. Nissen and R. Englund. This writing system is pictographic, made up of linear signs incised in clay tablets using a reed pen (both reeds and clay being very easily accessible in southern Mesopotamia). The majority of the texts of the Uruk period are concerned with management and accounting, so it is logical