Podcast
Questions and Answers
What defines functional requirements in software development?
What defines functional requirements in software development?
- They outline non-functional attributes such as usability and reliability.
- They detail the features and functions the system must provide. (correct)
- They specify the monetary costs associated with the project.
- They describe how well the system performs under load.
Which of the following best describes non-functional requirements?
Which of the following best describes non-functional requirements?
- They define how a system performs and behaves rather than what it does. (correct)
- They are requirements that are not related to user experience.
- They can be considered as part of the system's functional requirements.
- They are measurable characteristics of a system's functionality.
What is one of the potential risks mentioned in managing software requirements?
What is one of the potential risks mentioned in managing software requirements?
- Misunderstanding the business context of the software. (correct)
- Overly specific functional requirements.
- Too many technical specifications.
- Clarity in communication with customers.
What does the 'moving target problem' refer to in software development?
What does the 'moving target problem' refer to in software development?
Why is requirement elicitation considered a difficult stage?
Why is requirement elicitation considered a difficult stage?
What is meant by 'requirement iterations' in software development?
What is meant by 'requirement iterations' in software development?
How can changes in requirements affect software projects?
How can changes in requirements affect software projects?
What role does communication play during the requirement elicitation process?
What role does communication play during the requirement elicitation process?
What do functional requirements primarily describe?
What do functional requirements primarily describe?
Why are non-functional requirements essential for a software system?
Why are non-functional requirements essential for a software system?
Which of the following is a characteristic of functional requirements?
Which of the following is a characteristic of functional requirements?
What is one potential issue with imprecise non-functional requirements?
What is one potential issue with imprecise non-functional requirements?
How do functional requirements relate to the interactions between a system and its environment?
How do functional requirements relate to the interactions between a system and its environment?
Which of the following statements correctly describes the purpose of non-functional requirements?
Which of the following statements correctly describes the purpose of non-functional requirements?
In a Patient Management System, what does a functional requirement entail regarding appointment lists?
In a Patient Management System, what does a functional requirement entail regarding appointment lists?
What is a key distinction between functional and non-functional requirements?
What is a key distinction between functional and non-functional requirements?
Which aspect does usability primarily relate to in the context of non-functional requirements?
Which aspect does usability primarily relate to in the context of non-functional requirements?
What characteristic distinguishes functional requirements from non-functional requirements?
What characteristic distinguishes functional requirements from non-functional requirements?
Why is it important to quantify non-functional requirements?
Why is it important to quantify non-functional requirements?
At what stage of system testing are non-functional requirements typically assessed?
At what stage of system testing are non-functional requirements typically assessed?
Which type of constraints does the term 'design constraints' refer to?
Which type of constraints does the term 'design constraints' refer to?
What is a critical factor in measuring non-functional requirements?
What is a critical factor in measuring non-functional requirements?
When quantifying a non-functional requirement regarding ease of use, what must be specified?
When quantifying a non-functional requirement regarding ease of use, what must be specified?
Which of the following is considered a non-functional requirement?
Which of the following is considered a non-functional requirement?
What does the term 'Mean time to failure (MTTF)' refer to in software reliability testing?
What does the term 'Mean time to failure (MTTF)' refer to in software reliability testing?
Which of the following is NOT a measure of software reliability testing?
Which of the following is NOT a measure of software reliability testing?
What is meant by 'down time' in the context of reliability testing?
What is meant by 'down time' in the context of reliability testing?
In security testing, which ability is primarily tested?
In security testing, which ability is primarily tested?
Which metric reflects the success of security testing?
Which metric reflects the success of security testing?
What is a critical reliability factor indicated by the precision of calculations metric?
What is a critical reliability factor indicated by the precision of calculations metric?
Which of the following is a key aspect of security testing in hostile environments?
Which of the following is a key aspect of security testing in hostile environments?
What does 'attack surface exposure' measure in security testing metrics?
What does 'attack surface exposure' measure in security testing metrics?
What is the primary goal of vulnerability testing?
What is the primary goal of vulnerability testing?
Which of the following is not a method of vulnerability testing?
Which of the following is not a method of vulnerability testing?
What does throughput measure in performance testing?
What does throughput measure in performance testing?
Which performance testing metric indicates the maximum time to respond to a transaction request?
Which performance testing metric indicates the maximum time to respond to a transaction request?
What is the purpose of stress testing?
What is the purpose of stress testing?
Which of the following requirements illustrates an example of performance testing?
Which of the following requirements illustrates an example of performance testing?
What is the purpose of fuzz testing?
What is the purpose of fuzz testing?
Which statement is an example of a performance metric?
Which statement is an example of a performance metric?
Study Notes
Evolving Requirements
- Requirements can change during development due to changing business priorities, evolving customer understanding, or new risks or opportunities
- This is known as the “Moving Target Problem”
- Requirement engineering is an iterative process of elicitation, specification, and validation, to accommodate changing requirements
Functional and Non-functional Requirements
- Functional requirements specify “what” the software must do, from the user's perspective, describing the intended behaviors of a system
- Non-functional requirements (NFR) specify the “quality attributes” of the software, defining constraints or performance requirements
- NFR are important to ensure the system's usability and effectiveness, but imprecise NFR can be difficult to verify
Examples of Functional Requirements
- Functions the software must perform
- How the system should react to particular inputs
- What inputs the system should accept
- What outputs the system should produce
- What data the system should store
- What computations the system performs
Examples of Non-functional Requirements
- Quality Attributes: Reliability, Robustness, Security, Usability, Performance
- Design Constraints: Platform constraints, Response times
Measures of Non-functional Requirements
- NFR describe emergent properties of the system that must be measured and satisfied
- NFR are typically not checked in unit tests or static analysis, but require system-level testing with prototypes or the final system
- NFR quantification needs measurable metrics, avoid subjective terms, and require understanding of trade-offs between different requirements
Reliability Testing
- Measures of reliability include probability of no failure in a specified time, probability of failure on demand, mean time to failure (MTTF), and downtime
Security Testing
- Security testing focuses on resisting unauthorized usage, continuing to provide service to legitimate users under attack, and resisting denial of service (DoS) attacks
Performance Testing
- Performance testing focuses on requirements related to throughput, response time, memory utilization, I/O rates, latency, etc.
- Statistical testing based on an operational profile is often used, with probabilities and confidence levels
Performance Testing Metrics
- Throughput: amount of transactions processed in a given time
- Response time: average or maximum time to respond to a request
- Threshold: system behavior within required limits
- Stress: system behavior under extreme conditions
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Description
Explore the intricacies of software requirements engineering, focusing on both functional and non-functional aspects. Learn about the iterative process of elicitation, specification, and validation to adapt to changing business needs. Delve into real-world examples to understand the significance of precise requirements.
