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●Requirements validation is the process of checking that requirements actually define the system that the customer really wants. It overlaps with analysis as it is concerned with finding problems with the requirements. Requirements validation is important because errors in a requirements document can lead to extensive rework costs when these problems are discovered during development or after the system is in service. The cost of fixing a requirements problem by making a system change is usually much greater than repairing design or coding errors. The reason for this is that a change to the requirements usually means that the system design and implementation must also be changed. Furthermore, the system must then be re-tested.
During the requirements validation process, different types of checks should be carried out on the requirements in the requirements document. These checks include:
1. ___71___: A user may think that a system is needed to perform certain function. However, further thought and analysis may identify additional or different functions that are required. Systems have diverse stakeholders with different needs and any set of requirements is inevitably a compromise across the stakeholder community.
2. ___72___: Requirements in the document should not conflict. That is, there should not be contradictory constraints or different descriptions of the same system function.
3. ___73___: The requirements document should include requirements that define all functions and the constraints intended by the system user.
4. Realism checks: Using knowledge of existing technology, the requirements should be checked to ensure that they can actually be implemented. These checks should also take account of the ___74___ for the system development.
5. Verifiability: To reduce the potential for dispute between customer and contractor, system requirements should always be written so that they are verifiable. This means that you should be able to write a set of tests that can demonstrate that the delivered system meets each specified ___75___.
(71)A. Security checks B. Validity checks
C. Consistency checks D. Completeness checks
(72)A. Security checks B. Safety checks
C. Consistency checks D. Usability checks
(73)A. Consistency checks B. Usability checks
C. Operational checks D. Completeness checks
(74)A. tools B. tests C. models D. budget and schedule
(75)A. requirement B. model C. design D. implementation
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