Today, with the digitisation of texts, sounds and images and their circulation on the Internet, we are deploying new techniques for storing knowledge which will increasingly supplement and even replace older memory recording systems, such as books, vinyl discs, and photographs on celluloid. It looks as if the extent of these changes will be far reaching. And if, as many believe, the practical methods of inscribing thought have an impact on the way it is developed through the writing and reading process, we can understand why the changes now taking place could profoundly affect our ways of thinking. Here we have gathered together specialists in ancient means of recording memory - clay tablets, papyrus rolls and manuscripts - along with experts from the electronic age - originators of man-machine interfaces, enterprise knowledge management systems, hypermedia and intelligent agents - with the purpose of elucidating the present by reference to intellectual technologies of the past.