>>Given a conceptual design, apply the principles of modular design to derive the components and services of the logical design.
>>
>>Where might I find this information? I've already checked out the Fox WIKI site for study group session summaries and Case Study Conceptual Design as well as on-line documentation from MS. I've found materials that reference these two designs but no clear, concise explanations/comparisons.
>
>Hi Jeff. I posted this question myself a few days back. From what I can figure.
>
>Conceptual Design:
> - overview of functionality of the system
> - a few paragraphs or pages
> - use case diagrams are also used
> - meant to be an overview and very general and stable
>
>Logical Design
> - create entitiy definitions (these will become classes in the physical design)
> - group into layers (user interface, biz, data, and others)
> - do relational design and normalization
> - not until the physical design are specific hardware or software mentioned

We use a very similar model here for our applications (pretty much agency-wide), only the naming is really different.

1) Conceptual Design = Charter + High-Level Requirements, no more than a few pages total. These should basically never need to be changed, and should be completed before anything else is even considered.

2) Logical Design = Detailed Requirements + ER diagram (often a very large document composed by a large team). These do undergo changes during the project, for various reasons.

These two steps are theoretically done before any Physical Design - though in practice, it never completely works that way, the project would take too long :)