![]() An > lifeline generated from the business object.Each diagram template contains the following elements: If you are running this tutorial in our STEPS Wizard in Visual Paradigm, a set of initial Sequence Diagram templates have been automatically generated for each of the activities/processes identified. The result will be a set of MVC Sequence Diagrams that model the interactions. In this step, we will take a closer look at the interactions involved in these activities. The major system activities through which business objects are created, read, updated and deleted are identified. Step 3: Design the interactions in each activity The figure below shows an example of such a table. If necessary, you may include multiple performers here. Performer: The person (role) or other business entities who creates, reads, updates or deletes the business object through the activity / process chosen.Activity / Process: The system activity or process that creates, reads, updates or deletes the business object.CRUD: Whether the activity / process will create, read, update or delete the business object.Business Object: The business object being assessed.For each of the activities / processes identified, create a table row and enter the information below. Now, find out the major system activities or processes that (will) create, read, update and delete those business objects. ![]() In this step, you are required to find out how these objects will be used by the developing system - Are the objects created by the system, and if so, when? When will they be retrieved, modified or deleted by the system? Now that you have identified a set of business objects. Step 2: Identify the system activities that use the objects To learn more about ER Diagram, database design and the three kinds of data model, please read the article What is Entity Relationship Diagram (ERD). For example, 'many to many' tables may exist in logical or physical data model but they are just shown as a relationship with no cardinality under the conceptual data model. It defines what entities exist, NOT which tables. A conceptual ERD is developed to present an overall picture of the system by recognizing the business objects involved. The table below shows the difference between the three data models.Ĭonceptual ERD models the business objects that should exist in a system and the relationships between them. While all the three levels of ER model contain entities with attributes and relationships, they differ in the purposes they are created for and the audiences they are meant to target.Ī general understanding to the three data models is that business analyst uses conceptual and logical model to model the business objects exist in the system, while database designer or database engineer elaborates the conceptual and logical ER model to produce the physical model that presents the physical database structure ready for database creation.
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