The most influential document in computer science was John von Neumann's "First Draft of a Report on the EDVAC", a 101-page manuscript dating from 1946. Littered with ellipses and spaces for the eventual addition of further material, von Neumann never completed it, as by that time its distribution had already influenced an explosion in postwar computer development. Its elaboration of the stored program concept and formalization of the logical design of computer architecture—ideas not all of which were original to von Neumann but which he first expressed in the mathematical language he favoured—endure in the architectures of modern computer systems.