Task: Prioritize and Partition Use Cases
This task is where the system use cases are prioritized, so that their order of development can be decided and the architecturally-significant system use cases are identified and prioritized.
Disciplines: System Engineering Requirements
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      Main Description

      The selection of system use cases and scenarios is driven by the following:

      • The benefit of the scenario to stakeholders: critical, important, useful.
      • The architectural impact of the scenario: none, extends, modifies.
      • The risks to be mitigated: performance, availability of a product, and suitability of a component.

      In general the impact on architecture is correlated to the criticality. However, it must be noted that there might be critical use cases that have little or no impact, and vice versa, and some ancillary use cases can have a big impact on the architecture, which makes it questionable from a business perspective. The main concern is to select a set of use cases that ensures broad coverage (participation) of system internals, while still satisfying other constituencies.