Preferred Requirements Gathering Techniques - 2
Prototyping.
Prototyping is a technique for building a quick and rough version of a desired system or parts of that system. The prototype illustrates the capabilities of the system to users and designers. It serves as a communications mechanism to allow reviewers to understand interactions with the system. Prototyping sometimes gives an impression that developers are further along than is actually the case, giving users an overly optimistic impression of completion possibilities. Prototypes can be combined effectively with other approaches such as JAD and models.
Use Cases.
A use case is a picture of actions a system performs, depicting the actors. It should be accompanied by a textual description and not be used in isolation of other requirements gathering techniques. Use cases should always be supplemented with quality attributes and other information such as interface characteristics. Many developers believe that use cases and scenarios (descriptions of sequences of events) facilitate team communication. They provide a context for the requirements by expressing sequences of events and a common language for end users and the technical team.
Be cautioned that use cases alone do not provide enough information to enable development activities. Other requirements elicitation techniques should also be used in conjunction with use cases. Use operational concepts as a simple, cost-effective way to build a consensus among stakeholders and to address two large classes of requirements errors: omitted requirements and conflicting requirements. Operational concepts identify user interface issues early, provide opportunities for early validation, and form a foundation for testing scenarios in product verification.
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