A glimmer of hope Programs have already been verified For a control system for Paris Metro Mondex cash-card programs simulating hardware designs Sizew
{"Image DocumentName": "A glimmer of hope Programs have already been verified", "Image ImageDescription": "For a control system for Paris Metro. Mondex cash-card. programs simulating hardware designs. Sizewell B nuclear power station... Praxis Ltd. guarantees their software. The project starts with a glimmer of hope. This slide shows a number of examples in which verification technology has already delivered benefit in the achievement zero defect programs. They provide promising evidence of the feasibility and the desirability of program proofs, even if they have to be conducted with significant manual assistance. An early example was a control program for the Paris Metro, developed with the aid of the B refinement tool. There was a manual proof of the software of the Mondex cash card, ensuring that it could not be used to forge money. The Bank of England had to believe the proof. After a notoriously expensive error in a floating point unit, hardware simulation programs are often proved correct, as a protection against bugs in delivered computer chips. The software controlling the UK Sizewell B nuclear power station was exhaustively checked by hand, with machine assistance. And the UK software Company Praxis routinely offers a conventional guarantee for their delivered software, that they will without charge correct errors detected in software after delivery -- and there are usually still one or two errors to correct.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}