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=1.2 required=5.0 tests=BAYES_00,FROM_WORDY, INVALID_MSGID,LOTS_OF_MONEY autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fac41,e01bd86884246855 X-Google-Attributes: gidfac41,public X-Google-Thread: 103376,fb1663c3ca80b502 X-Google-Attributes: gid103376,public From: "Ken Garlington" Subject: Re: Interresting thread in comp.lang.eiffel Date: 2000/07/14 Message-ID: #1/1 X-Deja-AN: 646161736 References: <8ipvnj$inc$1@wanadoo.fr> <8j67p8$afd$1@nnrp1.deja.com> <395886DA.CCE008D2@deepthought.com.au> <3958B07B.18A5BB8C@acm.com> <395A0ECA.940560D1@acm.com> <8jd4bb$na7$1@toralf.uib.no> <8jfabb$1d8$1@nnrp1.deja.com> <8jhq0m$30u5$1@toralf.uib.no> <8jt4j7$19hpk$1@ID-9852.news.cis.dfn.de> <3963CDDE.3E8FB644@earthlink.net> <3963DEBF.79C40BF1@eiffel.com> <2LS85.6100$7%3.493920@news.flash.net> <8k5aru$1odtq$1@ID-9852.news.cis.dfn.de> <8k8pk2$20cab$1@ID-9852.news.cis.dfn.de> <_dS95.9945$7%3.666180@news.flash.net> <#flPTbB7$GA.367@cpmsnbbsa07> <#utiFKO7$GA.280@cpmsnbbsa09> X-Priority: 3 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 X-Complaints-To: abuse@flash.net X-Trace: news.flash.net 963542571 216.215.65.127 (Thu, 13 Jul 2000 21:42:51 CDT) Organization: FlashNet Communications, http://www.flash.net X-MSMail-Priority: Normal NNTP-Posting-Date: Thu, 13 Jul 2000 21:42:51 CDT Newsgroups: comp.lang.ada,comp.lang.eiffel Date: 2000-07-14T00:00:00+00:00 List-Id: "Bob Allen" wrote in message news:#utiFKO7$GA.280@cpmsnbbsa09... > > Ken Garlington wrote in message > news:Yx7b5.13181$7%3.916718@news.flash.net... > > "Bob Allen" wrote in message > > news:#flPTbB7$GA.367@cpmsnbbsa07... > > > The same applies when you go to build a system based in part or in whole > > of > > > existing components. > > > You look at the contract that the components offer and decide if the > terms > > > are acceptable. > > > > This is (potentially) true if you are buying software components. However, > > the contractor for Ariane 5 was not buying software components. That's why > > this model falls apart for Ariane 5. > > > > The Ariane 5 project "bought" software components from Ariane 4 without > knowing exactly what they were getting. Untrue - Arianespace bought an SRI system (a box - a picture of which is at http://www.flash.net/~kennieg/sextant.jpg ), not a set of software components. They probably cared as much about the source language in the SRI as you care about the source language of the software in your car's computers. OTOH, the vendor that delivered the Ariane 5 SRI (Sextant) was the same vendor who wrote the software for Ariane 4. They knew exactly what the software was. They just didn't know the characteristics of the total system (the rocket -- not a software simulation of a rocket -- a real live fire-belching tube) into which their SRI was to be used. Brownie points to the first person who can identify those glowing triangles at the left of the picture (and why they glow!).