You should have generated a preliminary data structure when you created a prototype for the user interface. That structure did not consider distribution, integrity or performance.
In this activity, you produce the data structures, including specifications for how the data structures are to be distributed between clients and servers, if at all. You identify the structural business rules that define the database integrity constraints. However, you do not include the definition of any data or program structures that are required for enforcing security and integrity or for data conversion or bridging. Those elements are covered in subsequent activities.
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