LANPAR: The Forgotten First Spreadsheet Software

This article revisits the history of LANPAR, the first spreadsheet software invented in 1971 by Bell Canada engineers Rene Pardo and Remy Landau, predating VisiCalc by a decade. The piece details its innovative technology, including the grid system, cell reference mechanism, and forward reference feature, which allowed users to dynamically create budget models without programmer intervention. By explaining its working principles—such as data input methods, calculation cycles, and patent information—the article reveals this technology’s profound impact on software development, laying the foundation for modern spreadsheets and marking an important milestone in computer science history.