Creating a Logical Data Model
Let’s go back to our Baker Cakes example. In the last chapter, we created a Conceptual data model, shown again for reference in Figure 18.20, to define the core business concepts and relationships of the organization. We’ll now want to refine the model, and add more detail.
Figure 18.20 Relational Conceptual Model for Baker Cakes
Let’s use this Conceptual model as a starting point for our ‘top-down’ design. If you don’t have it handy, you can download a sample Baker Cakes Conceptual.erwin model from www.erwin.com/datamodelingmadesimple.
To derive a logical model from the conceptual model we created, select Actions|Design ...