Business Process Design
Obviously, the first step in system development would be the modelling of its organizational
structure via the ORG diagram:
The next step could be a high level informal description of the business process with the goal of capturing
the functionality of the Autoparts Trading Company in general. We consider only one of the business processes
going on in the Company, namely, Order Processing
Further, a more detailed business process model should be developed where events correspond to
real documents circulating in the Company. In addition, the role of the Information System under
development is also shown in the model:
The complicated task Process Order, which is most closely related to the Information System , is refined by a BP diagram of its own.
The Business Process Reengineering phase is omitted for this example and we assume that
the business process defined herein
has already reached final version.
Information System Design
Now we are ready to move on to the Information System specification phase. To initiate this, we have to
"extract" from the business process all tasks which are to performed by the Information System (as a
At first, starting from the ORG diagram, we build a CO diagram, in order to specify all information
flows between objects contained in the Autoparts Trading Company. Three levels of subordinated
CO diagrams happen to be necessary:
The next step could be data modelling. Data modelling could have been done as part of the initial modelling
of the business processes, but was postponed in this case. We can perform this modelling by means of
GRADE DD Datatype and ER diagrams.
Note the use of subtype entities in the ER model.
Now it's time to specify the software, the general behaviour of which was already described in the
business process. In GRADE this specification is performed via PD
The previous diagram actually specifies a small part of the software - the fragment of the
Order Processing application related to supporting the Salesman in finding out what is to be done
in order to full the order. This
application is assumed to be a typical client application based on a Windows GUI and using
the company data base (Sales_Data) on a server.