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This model can be further refined by adding the high-level interaction called Repository Access between the user and the system (level 2), as shown in Figure 4.3-1. This level can be further refined by adding detail to the interactions, specifying types of access to the Repository, namely Query, Identify and Aggregate Data (level 3). This is also depicted in the figure.
Figure 4.3-1 Level 2 and Level 3 Use Cases
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