If every requirement can be checked by a cost-effective process, then SRS is called
Verifiable
Understanding Verifiable Requirements in SRS
A Software Requirements Specification (SRS) document is crucial in the software development lifecycle. It serves as a blueprint, detailing what the software needs to do. A good SRS possesses several key characteristics that ensure clarity, completeness, and manageability. One such characteristic is verifiability.
Let's delve into the concept of a Verifiable SRS based on the condition presented in the question.
What Makes an SRS Verifiable?
The question states that if every requirement in an SRS can be checked by a cost-effective process, then the SRS has a specific quality. This quality directly relates to the concept of verifiability.
A requirement is considered verifiable if there exists a definite, quantitative, and cost-effective process or test that can be applied to the finished software to determine whether the requirement is satisfied.
- If a requirement is subjective or cannot be tested objectively, it is difficult or impossible to verify.
- Requirements like "the system should be user-friendly" are often not verifiable unless "user-friendly" is defined using quantifiable metrics (e.g., average time to complete a task, satisfaction score from a usability test).
- The ability to check each requirement ensures that testing can be planned effectively and that there is clear criteria for acceptance.
The condition "every requirement can be checked by a cost-effective process" is the very definition of a verifiable SRS.
Analyzing the Options for SRS Characteristics
Let's look at the provided options and see how they relate to the question's condition:
| Characteristic | Description | Relevance to the Question |
|---|---|---|
| Verifiable | Each requirement can be checked using a cost-effective process to see if the final software meets it. | Directly matches the condition given in the question. |
| Tracable | Each requirement can be traced back to its origin and forward to design, code, and test cases. | Important for managing changes and understanding impact, but not directly about the ability to *check* the requirement in the final product. |
| Modifiable | The SRS can be easily changed completely and consistently when requirements evolve. | Important for maintaining the document over time, but not about checking requirements against the final software. |
| Complete | The SRS includes all necessary requirements (functional, non-functional, constraints) and responses to all possible inputs. | Ensures nothing is missing, but doesn't guarantee that the requirements listed can be verified. |
Conclusion: Why Verifiable is Correct
Based on the definitions, the characteristic that means every requirement can be checked by a cost-effective process is **Verifiable**. This ensures that the software can be tested thoroughly and that the final product meets the specified requirements objectively.
Therefore, if every requirement can be checked by a cost-effective process, the SRS is called **Verifiable**.
Revision Table: Key SRS Qualities
| Quality | Description Summary |
|---|---|
| Correct | States every requirement that the software must meet. |
| Unambiguous | Every requirement has only one interpretation. |
| Complete | Includes all significant requirements and responses. |
| Consistent | Requirements do not conflict with each other. |
| Verifiable | Each requirement can be checked by a cost-effective process. |
| Modifiable | Structure allows for easy and consistent changes. |
| Traceable | Origin and impact of each requirement can be tracked. |
Additional Information: Importance of a Good SRS
Creating a high-quality SRS document is fundamental to successful software development. A good SRS minimizes misunderstandings between stakeholders (customers, developers, testers, project managers). It provides a stable basis for design, implementation, and testing. Characteristics like verifiability, completeness, consistency, and modifiability all contribute to reducing risks, saving time, and lowering development costs in the long run.
A Verifiable SRS is particularly important because it directly impacts the testability of the software. If requirements aren't verifiable, it becomes difficult to prove that the developed system actually satisfies what was asked for, leading to potential disputes and rework.
Important Questions from Software Requirement
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
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.
