The Software Requirement Specification (SRS) is said to be ______ if and only if no subset of individual requirements described in it conflict with each other.
Consistent
Understanding Software Requirement Specification (SRS) Consistency
A Software Requirement Specification (SRS) is a document that describes what the software will do and how it will perform. It serves as a blueprint for the software development process. For an SRS to be effective, it must possess certain qualities. One of the most critical qualities is consistency.
What is SRS Consistency?
The question asks for the term that describes an SRS where no subset of individual requirements described in it conflict with each other. This is the definition of consistency in the context of software requirements.
- Consistency means that there are no contradictions among the requirements. For example, one requirement might state that a user must enter a password, while another requirement states that the system allows access without a password for the same function. These requirements conflict, making the SRS inconsistent.
- In a consistent SRS, all requirements can coexist logically without causing conflicts or ambiguities in the system's expected behavior.
Evaluating Other SRS Properties
Let's look at the other options provided and see why they don't match the definition given in the question:
- Correct: A requirement is correct if it accurately reflects the needs of the user or stakeholder. Correctness is about whether the requirement is right in itself, not about whether it conflicts with other requirements.
- Unambiguous: A requirement is unambiguous if it has only one possible interpretation. Each individual requirement should be stated clearly so that there is no confusion about what is required. While ambiguity can sometimes lead to perceived conflicts, the definition in the question specifically refers to conflicts between requirements, not ambiguity within a single requirement.
- Verifiable: A requirement is verifiable if there exists some cost-effective process (inspection, analysis, test, demonstration) that can determine whether the software product satisfies the requirement. Verifiability ensures that we can actually check if the final software meets the requirement. This is different from checking for internal conflicts within the document.
Comparison of SRS Properties
Here's a brief comparison of the terms discussed:
| Property | Description | Relates to... |
|---|---|---|
| Correct | Accurately reflects user needs | Accuracy of the requirement itself |
| Consistent | No conflicts among requirements | Relationships between requirements |
| Unambiguous | Has only one interpretation | Clarity of the requirement statement |
| Verifiable | Can be tested to see if met | Ability to confirm implementation |
Based on the definition provided in the question – "no subset of individual requirements described in it conflict with each other" – the correct term is Consistent. An inconsistent SRS can lead to significant problems during design and implementation, as developers will face contradictions that are impossible to resolve in the code.
Revision Table: Key SRS Qualities
| Quality | Explanation |
|---|---|
| Complete | All necessary requirements are included. |
| Consistent | No requirement conflicts with another. |
| Correct | Each requirement is accurate. |
| Unambiguous | Each requirement has only one meaning. |
| Verifiable | Can test if requirement is met. |
| Modifiable | Can be easily changed while maintaining structure. |
| Traceable | Each requirement can be traced back to its origin. |
| Ranked | Requirements are prioritized. |
Additional Information on Software Requirement Specification (SRS)
The SRS document is typically created after the feasibility study and before the design phase in the software development lifecycle. It serves as the official statement of what the customer requires and what the developer will deliver. A well-written SRS is crucial for the success of a software project because it:
- Helps ensure the software meets customer needs.
- Reduces development costs by identifying issues early.
- Provides a basis for project planning and management.
- Acts as a contract between the customer and the development team.
Maintaining consistency throughout the SRS is vital. Conflicts can arise from various sources, such as differing perspectives of stakeholders, errors in transcription, or changes made to requirements without considering their impact on others. Tools and techniques like requirements reviews, walkthroughs, and automated analysis can help detect inconsistencies.
Important Questions from Software Requirement
If every requirement can be checked by a cost-effective process, then SRS is called
The process to gather the software requirements from client, analyze and document is known as -
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): A load-and-go assembler avoids the overhead of writing the object program out and reading it back in.
Reason (R): This can be done with either one-pass or two pass assembler.
In the light of the above statements, choose the correct answer from the options given below:
In software engineering, what kind of notation do formal methods predominantly use?
If every requirement stated in the Software Requirement Specification (SRS) has only one interpretation, then SRS is said to be
