{"id":339155,"date":"2016-12-20T09:21:01","date_gmt":"2016-12-20T17:21:01","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/?post_type=msr-research-item&p=339155"},"modified":"2018-10-16T20:20:48","modified_gmt":"2018-10-17T03:20:48","slug":"specifying-verifying-fault-tolerant-systems","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/specifying-verifying-fault-tolerant-systems\/","title":{"rendered":"Specifying and Verifying Fault-Tolerant Systems"},"content":{"rendered":"

Willem-Paul de Roever invited me to give a talk at this symposium. I was happy to have a podium to explain why verifying fault-tolerant, real-time systems should not be a new or especially difficult problem. This was already explained in [106]<\/a> for real-time systems, but I knew that there would be people who thought that fault-tolerance made a difference. Moreover, de Roever assured me that L\u00fcbeck, where the symposium was held, is a beautiful town. (He was right.) So, I decided to redo in TLA the proof from [51]<\/a>. However, when the time came to write the paper, I realized that I had overextended myself and needed help. The abstract states<\/p>\n

We formally specify a well known solution to the Byzantine generals problem and give a rigorous, hierarchically structured proof of its correctness. We demonstrate that this is an engineering exercise, requiring no new scientific ideas.<\/p>\n

However, there were few computer scientists capable of doing this straightforward engineering exercise. Stephan Merz was one of them. So, I asked him to write the proof, which he did with his usual elegance and attention to detail. I think I provided most of the prose and the initial version of the TLA specification, which Merz modified a bit. The proof was all Merz’s.<\/p>\n","protected":false},"excerpt":{"rendered":"

Willem-Paul de Roever invited me to give a talk at this symposium. I was happy to have a podium to explain why verifying fault-tolerant, real-time systems should not be a new or especially difficult problem. This was already explained in [106] for real-time systems, but I knew that there would be people who thought that […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":[{"type":"user_nicename","value":"lamport","user_id":"32614"}],"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"Formal Techniques in Real-Time and Fault-Tolerant Systems, H. Langmaack, W.-P. de Roever, J. Vytopil editors. 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