How did the Sumerians develop writing

This early type of writing practised by the Ancient Sumerians is called cuneiform or impressing onto clay tablets an alphabet as well as numbers or scores to record anything from a simple bill of sale, a record of what was bought or sold, inventories of storehouses and even marriage, dowry, and letters of communication. Clay was abundant and inexpensive. Papyrus developed later was a time consuming, labour. A dried and kiln fired clay tablet was a bit heavy, yet so durable they have been unearthed today intact. The soft clay was pressed into by a scribe who used a stylus typical shapes were triangle shaped at the end and the other end round or elongated. Errors could be easily wiped clear and edited with a soft wet cloth. Once the tablet was sealed by its preparer or signed, it was dried then fired as pottery was. A recorded event, a bill of sale an army captains orders could then be dispatched in a written form. Some tablets have been found to contain more than one persons recorded information almost resembling “scratch” paper notes reused until no space remains or like a card signed by more than one author. This early type of writing practised by the Ancient Sumerians is called cuneiform or impressing onto clay tablets an alphabet as well as numbers or scores to record anything from a simple bill of sale, a record of what was bought or sold, inventories of storehouses and even marriage, dowry, and letters of communication