If a use case diagram is modified due to a design omission, which diagrams would

Question

If a use case diagram is modified due to a design omission, which diagrams would need to be revisited and potentially revised? During the design of interaction diagrams, if a missing actor is identified, which diagrams would need to be revisited and potentially revised? How important is it to keep the analysis models updated when changes are made to design models? This is an interesting question particularly in the context of Agile development. If analysis models are used to document business requirements decisions, how important is it to keep them current, especially prior to user acceptance testing?

Explanation / Answer

If the use case diagram is modified, then the sequence diagram, data flow diagram and interaction diagrams also need to be revisited and potentially revised.

If a missing actor is identified then the use case diagram, data flow diagram and the sequence diagram need to be revisited and potentially revised.

The analysis models actually guide the implementation of the design models and hence both should be in sync. If they are not in sync, then during implementation, the expected design of the system will not be achieved.

It is ver important to achieve the exact business requirements in agile developments. As delivery is made in sprints, the analysis model is the most important tool that guides the development and delivery from one sprint to another in agile development. The analysis model should always be updated in line with the business requirements so that the delivery team can reference it during implementation.

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