Re: Relation or attribute and why

On 23 May 2006 15:44:15 -0700, "dawn" <dawnwolthuis_at_gmail.com> wrote:

>Gene Wirchenko wrote:
>> On 23 May 2006 13:44:29 -0700, "dawn" <dawnwolthuis_at_gmail.com> wrote:
>>
>> [snip]
>>
>> >In my example, the conceptual data model includes: name, firstName,
>> >lastName with relationships such that name has-a firstName and name
>> >has-a lastName.
>>
>> That is part of the logical model. The conceptual model is the
>> business statement.
>
>The identification of name, lastName, firstName and the relationships
>among these terms is not part of the business scope and definition, the
>conceptual data model? What would the CDM include related to these
>terms? I put everything that is conceptual and not directed to a
>particular implementation model (such as the RM) in the CDM. Where do
>you draw the (possibly fuzzy) line? --dawn

     Possibly fuzzy, but nonetheless.

     Conceptual might fit on a napkin: "We want an E-commerce Web site for selling our products. It has to be able to handle North America, but we plan to go international, so have the capability to add other languages, etc. easily without rewriting large chunks. We want someone able to complete an order quickly. Do not forget good security. OtherCorp recently had a bad situation, and they are taking a kicking. Now is our chance, if we do it right."

     Logical gets into the details, but not the implementation.

Sincerely,

Gene Wirchenko Received on Wed May 24 2006 - 01:53:24 CEST