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Questions and Answers
What is necessary for functionality to be evaluated in RE?
What is necessary for functionality to be evaluated in RE?
Functionality must be evaluated in an operational context.
What are two ways functions can be described in RE?
What are two ways functions can be described in RE?
Functions can be described using business process models and use cases.
Why is it important to view functions on different levels in RE?
Why is it important to view functions on different levels in RE?
Viewing functions on different levels allows for a comprehensive understanding of system requirements.
What is a business process model in the context of RE?
What is a business process model in the context of RE?
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What is the purpose of use cases in RE?
What is the purpose of use cases in RE?
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What do function hierarchies represent in RE?
What do function hierarchies represent in RE?
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What type of model is a behavioral model in RE?
What type of model is a behavioral model in RE?
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What does the term 'usage context' refer to in RE?
What does the term 'usage context' refer to in RE?
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What is the significance of the component model in RE?
What is the significance of the component model in RE?
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How do modes contribute to understanding system requirements?
How do modes contribute to understanding system requirements?
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Study Notes
System Functions and Hierarchies
- Identification of System Functions: Functions are derived through scenarios to outline system behavior.
- Refinement and Interactions: Functions are refined and interactions among components are identified for clarity.
- Interface Specification: Involves defining user interactions, such as entering user credentials and verifying accounts against a database.
Use Case Definition
- Use Case: A collection of all potential scenarios for an actor aiming to fulfill a technical goal through the system.
- Scenario: Represents a sequence of interactions between an actor and the system, detailing the actions taken.
Distinction Between Use Cases and Scenarios
- Use Case: Comprised of multiple scenarios, providing a broader overview of functionality.
- Scenario: Specifically an ordered interaction, focusing on functional requirements and can be broken down into smaller actions.
- Outcome Variability: Scenarios can lead to either successful or unsuccessful results.
Use Cases and Scenarios Overview
- ATM Example: Various actions like transferring money, depositing, and paying out are illustrated as parts of the use case.
- Purpose and Context: Use cases provide structured views that encompass multiple scenarios, highlighting the intent behind system behavior.
Function Hierarchy Definition
- Function: A visible aspect of the system's behavior from the interface viewpoint, serving specific purposes.
- Function Hierarchy: Analyzes and structures functions and sub-functions, mapping their dependencies and interactions.
Importance of Function Hierarchies
- System Behavior Overview: Helps in understanding and analyzing system functionalities.
- Use Case Connection: Functions are identified and refined based on use cases, emphasizing their significance in requirements engineering.
- Operational Context: Functionality needs to be contextualized within operational frameworks to ensure comprehensive understanding.
Levels of Function Description
- Business Process Models: Functions can be represented through various formats including business processes, use cases, scenarios, and function hierarchies.
- Behavior Models: Such models outline how functions interact with system components and help in structuring system behavior.
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Description
This quiz covers the identification of system functions based on scenarios, refinement of functions, and specification of interfaces. Topics include authentication, connection to scooters, and more.
