- It has been adapted to store and process only particular types of information.
- In order to survive, ancient hunter-gatherers had to remember the shapes, qualities and behaviour patters of thousands of plants and animal species.
- They also had to bear in mind the opinions and relations of several dozen band members.
- It did not adapt to store and process numbers.
Because of this limitations and the need for running kingdoms and empires after a critical threshold of people / property, Sumerians invented a data-processing system called Writing