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=0.6 required=5.0 tests=BAYES_40,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fac41,9a0ff0bffdf63657 X-Google-Attributes: gidfac41,public X-Google-Thread: 1108a1,9a0ff0bffdf63657 X-Google-Attributes: gid1108a1,public X-Google-Thread: f43e6,9a0ff0bffdf63657 X-Google-Attributes: gidf43e6,public X-Google-Thread: 103376,4b06f8f15f01a568 X-Google-Attributes: gid103376,public From: "Paolo F. Cantoni" Subject: Re: Which wastes more time? (Was Re: Software landmines (loops)) Date: 1998/09/09 Message-ID: <6t6o05$k8u$1@the-fly.zip.com.au>#1/1 X-Deja-AN: 389512110 References: <6sbuod$fra$1@hirame.wwa.com> <6sebjr$b69$1@nnrp1.dejanews.com> <6sff74$q0s@gurney.reilly.home> <6sh2j5$jnl$1@nnrp1.dejanews.com> <35EC2E5A.16DB6CB1@bigfoot-.com> <6sjc0a$1lk$3@news.indigo.ie> <35EFB09E.15412933@s054.aone.net.au> <35f2bd98.40599408@news.erols.com> <35F06A58.F968BDE1@s054.aone.net.au> <35f48276.90997557@news.erols.com> <35F0C3C9.D1E56FF3@s054.aone.net.au> X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3155.0 Organization: -Semantica- Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.lang.ada Date: 1998-09-09T00:00:00+00:00 List-Id: Hi Patrick, I've come in late on this discussion - so please excuse some unfamiliarity. Patrick Logan wrote in message ... >In comp.object Loryn Jenkins wrote: > >: if I recall correctly, Bertrand has class CAR_OWNER inherit from class >: PERSON. (He offers this as an example of 'how to do inheritance well'.) > >: I can't believe it is acceptable because it does not model our >: concept of reality. > >The way I explain my objection to this inheritance relationship is >that the design may be too rigid for the requirements. Rather than >assume I share some concept of reality with the customer, I would ask >the customer if the system must responsible for tracking people that >become car owners and people who stop being car owners. Even if the >customer says no, I would still lean toward supporting that >possibility in teh future. Then why did you ask the client? You seem to have intended to ignore their answer... (NOTE: Not flaming, just asking...) > >So my concept of reality led me to question the requirements. The >requirements led me to challenge the design. I am not out to model >reality in my design. I am out to fulfill the requirements. > Regardz, Paolo F. Cantoni Tel: +61-2-9498 5945 Director Fax: +61-2-9418 4402 -Semantica- Cell: +61-416 11 00 95 Suite 2, Charing House EMail: pcantoni@semantica.com.au 45 Kendall Street Web: http://www.semantica.com.au Pymble NSW 2073 AUSTRALIA "Many problems turn out to be caused by invalid concepts. Conceptual Modelling provides techniques for solving them..." -Semantica- can help your organisation understand itself better and thus operate more effectively and efficiently...