From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fac41,a48e5b99425d742a X-Google-Attributes: gidfac41,public X-Google-Thread: ffc1e,a48e5b99425d742a X-Google-Attributes: gidffc1e,public X-Google-Thread: f43e6,a48e5b99425d742a X-Google-Attributes: gidf43e6,public X-Google-Thread: 103376,a48e5b99425d742a X-Google-Attributes: gid103376,public X-Google-Thread: 107d55,a48e5b99425d742a X-Google-Attributes: gid107d55,public X-Google-Thread: 1108a1,5da92b52f6784b63 X-Google-Attributes: gid1108a1,public From: Bertrand Meyer Subject: Re: Papers on the Ariane-5 crash and Design by Contract Date: 1997/03/17 Message-ID: <332DA14C.41C67EA6@eiffel.com>#1/1 X-Deja-AN: 226267549 References: <332B5495.167EB0E7@eiffel.com> Organization: Interactive Software Engineering Inc. Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.programming.threads,comp.lang.ada,comp.lang.java.tech Date: 1997-03-17T00:00:00+00:00 List-Id: Robert I. Eachus wrote: > How many times do people have to be told that the lack of an > assertion was NOT the problem here. The assertion existed Where? > [...] The real problem was that the software was used unchanged and > without review [from Ariane 4 to] Ariane 5, where these assumptions > were not true. The real problem was that the assertion was not part of the software. Successful reuse requires that what you reuse be equipped with a specification - a contract. That's the point made Jean-Marc Jezequel and I made in the article at http://www.eiffel.com/doc/manuals/technology/contract/ariane/index.html. -- Bertrand Meyer, President, ISE Inc., Santa Barbara (California) 805-685-1006, fax 805-685-6869, - ftp://ftp.eiffel.com Visit our Web page: http://www.eiffel.com (including instructions to download Eiffel 4 for Windows)