ProQuest Dialog
Dialog is an online information service owned by ProQuest, who acquired it from Thomson Reuters in mid-2008.[5] According to its literature,[6] it was "the world's first online information retrieval system to be used globally with materially significant databases".In the 1980s, a low-priced dial-up version of a subset of Dialog was marketed to individual users as Knowledge Index.[7] This subset included INSPEC, MathSciNet, over 200 other bibliographic and reference databases, as well as third-party retrieval vendors who would go to physical libraries to copy materials for a fee and send it to the service subscriber.Prior to being owned by Thomson, MAID purchased Knight-Ridder Information which included the Dialog and DataStar businesses.