Prior to the widespread use of the Internet, Nadin developed several computer-aided educational aids. Docent, a HyperCard based software program, was integrated in the CD-ROM for interactive learning. (Docent is a metaphor for interactive learning and teaching.) Both Docent and MetaDocent were first developed for the videodisc medium. MetaDocent gave users the possibility to create individualized image/text files. The indexing of image, sound, navigation, and especially the possibility to produce an individualized record (through an integrated Notebook application) were unique at the time