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=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,CP1252 X-Google-Thread: 103376,f948976d12c7ee33 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-07-03 00:38:32 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!newshub.sdsu.edu!elnk-pas-nf2!newsfeed.earthlink.net!wn14feed!worldnet.att.net!204.127.198.203!attbi_feed3!attbi_feed4!attbi.com!rwcrnsc52.ops.asp.att.net.POSTED!not-for-mail Message-ID: <3F03DD73.1010006@attbi.com> From: "Robert I. Eachus" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01 X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Boeing and Dreamliner References: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit NNTP-Posting-Host: 24.62.164.137 X-Complaints-To: abuse@comcast.net X-Trace: rwcrnsc52.ops.asp.att.net 1057217910 24.62.164.137 (Thu, 03 Jul 2003 07:38:30 GMT) NNTP-Posting-Date: Thu, 03 Jul 2003 07:38:30 GMT Organization: Comcast Online Date: Thu, 03 Jul 2003 07:38:30 GMT Xref: archiver1.google.com comp.lang.ada:40006 Date: 2003-07-03T07:38:30+00:00 List-Id: Dennis Lee Bieber wrote: > Surely there was a /requirements/ document for both A-4 and A-5, and > somewhere in there was something specifying the performance of the > vehicles. /That/ should have been the red-flag that something needed to > be retested. That is, if the A-4 had a spec stating some performance > feature of "x", and the A-5 equivalent shows "X+1", then shouldn't the > software responsible for handling the spec be tested to ensure it can > handle "X+1"? Correct. But what happened in the Ariane 5 case was a very well documented case of someone early on in the project defining how that testing was to be done, and management for cost reasons deciding not to do that particular testing--because the SRI had not changed one bit from the Ariane 4. Anyone with major project experience should know this. Any changes in the test plan have to be referenced back through the requirements allocations to see whether there are some requirements that are not being tested. In this case the requirements that were not tested were that the SRI could control an Ariane 5, and that the SRI could accept the Ariane 5 trajectory. Pretty fundamental requirements to fail to test. -- Robert I. Eachus �In an ally, considerations of house, clan, planet, race are insignificant beside two prime questions, which are: 1. Can he shoot? 2. Will he aim at your enemy?� -- from the Laiden novels by Sharon Lee and Steve Miller.