CASE Methodology question

Questions on Oracle CASE Methodology.... Hi,
I have couple of questions on defining functions in the CASE tool.

 How do you decide which function is a elementary function? Here is an example -

 A purchase order contains

                Purchase order header information
                        Line items
                        Header Attachments or different type of notes
                          Line item notes - different types
                          Line item accounting information
                        Routing information
                        Approval authority

Here one Purchase order may contain many lineitems.

   line item may contain many lineitem atttachments    lineitem may contain may charged to many accounts

Purchase header may have many attachments ( header attachments )

Purchase order may be routed to many people

Purchase order may need approval from more than one authority

      While defining functions

Should we consider Maintain Purchase order as an elementary function or

Should we split the Maintain Purchase order into number of small elementary
functions because of the complexity of the functional activities of the PO
creation process ( meaning each sub function itself is complex enough to be
identified as an elementary function )

What is the dest mechanism to identify an elementary function or "Draw the
Boundary" ?

What is the effect of splitting "Maintain PO" into number of elementary

function on the implementation?

One effect that I know of is -

   Each elementary function becomes Module in the design phase, so all the
elementary functions like ( maintain header attachments, maintain routing
information , maintain accounting information etc... ) will become screens.

But if I define Maintain PO as one activity - then

   Lineitem attachments , routing etc.. will be different blocks.

Could you please give some suggestions on the above problem?

I would like to thank you in advance.. for your help.

Regards ,

Suresh Anantpurkar

anantpur_at_ix.netcom.com Received on Tue Aug 15 1995 - 00:00:00 CEST