However Arab script developed much later than other systems of writing, not until the 5th and 6th centuries. The pre-Islamic period relied solely on an oral tradition which used story-telling, poetry and songs to communicate ideas. Even the Koran was first transmitted by word of mouth. But gradually it became apparent that a written script was needed for all walks of life, especially to deal with the burgeoning amount of administration that was required by the unification of their new territories in al-Andalus and elsewhere. And it was felt very strongly that the Koran, being the Word of Allah should be written down.
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