Use Case Analysis Questions and Answers for Viva

Answer-1: A use case is a description of a system?s behavior as it responds to a request from a user or another system. It defines interactions between a system and its users to achieve a specific goal.

Answer-2: Use case analysis helps identify system requirements by focusing on interactions between the system and external entities. It clarifies system behavior and aids in defining functional requirements.

Answer-3: Key components of a use case include the actor(s), use case name, preconditions, postconditions, flow of events (basic and alternative), and exception handling.

Answer-4: An actor represents any entity that interacts with the system, typically a user or another system. It initiates a use case or interacts with the system to achieve a goal.

Answer-5: Primary actors initiate a use case, while secondary actors provide a service or support to the primary actor in achieving their goal.

Answer-6: A use case diagram is a visual representation of the interactions between actors and the system. It shows the system's functionalities and how actors interact with them.

Answer-7: Functional requirements describe what the system must do, while use cases describe how the system will accomplish those tasks through interactions with actors.

Answer-8: The flow of events describes the sequence of actions that take place during the execution of a use case, including the basic flow (normal sequence) and alternative or exception flows.

Answer-9: The basic flow is the normal, expected sequence of events in a use case, while the alternate flow describes scenarios where the process deviates due to exceptions or alternative conditions.

Answer-10: Preconditions are conditions that must be true before a use case can be initiated, ensuring that the system is in a valid state for the use case to proceed.

Answer-11: Postconditions are conditions that must be true after a use case has completed, describing the state of the system after the use case execution.

Answer-12: Exception handling defines how the system should react to unexpected situations, ensuring robustness by detailing alternative flows or error messages when problems occur.

Answer-13: A use case represents a complete interaction between the actor and the system, while a scenario is a specific instance or sequence of events that occurs within a use case.

Answer-14: Use cases provide detailed descriptions of system behavior, which help developers design the system's functionality and interactions, ensuring the design aligns with user needs.

Answer-15: Use case analysis helps identify and clarify functional requirements by capturing how the system should behave from the user's perspective, ensuring complete and accurate requirements.

Answer-16: Challenges include identifying all potential actors, ensuring completeness, handling complex workflows, and managing evolving requirements or ambiguous stakeholder inputs.

Answer-17: Actors are identified by considering who will interact with the system?end users, external systems, or other entities that trigger or are affected by system behavior.

Answer-18: Yes, use cases can be reused across different projects if the systems have similar functionalities or if the same actors and interactions are involved.

Answer-19: Use cases can be prioritized based on business value, user needs, and system dependencies, often using techniques like MoSCoW (Must have, Should have, Could have, Won't have).

Answer-20: A use case is a detailed description of a system?s functionality, while a user story is a simple, short description of a feature or requirement from the user's perspective in Agile.

Answer-21: "Include" represents a mandatory sub-function that is part of a use case, while "extend" represents optional behavior that extends the use case under specific conditions.

Answer-22: Use cases are modeled in UML using use case diagrams, which show actors, use cases, and relationships between them (such as include, extend, or associations).

Answer-23: An abstract use case is a generic or high-level use case that serves as a template for more specific use cases, typically containing common functionality shared by multiple use cases.

Answer-24: Use cases are used to develop test cases that verify if the system functions correctly according to the specified interactions between the system and actors.

Answer-25: Use case analysis helps identify the main functionalities and objects in the system, which can be mapped to classes and methods in an object-oriented design.

Answer-26: Yes, use cases can evolve as new requirements emerge, as stakeholders refine their needs, or as the system undergoes iterative development or Agile sprints.

Answer-27: Complex use cases are broken down into smaller, simpler sub-cases or by creating abstract use cases and using modular design to manage complexity and ensure clarity.

Answer-28: Types of use cases include essential use cases (high-level, abstract), real use cases (detailed), and abstract use cases (representing common functionality across systems).

Answer-29: Multi-system use cases are handled by identifying interactions between systems, describing external interfaces, and ensuring that communication and synchronization are defined in the flow.

Answer-30: Use case analysis helps decompose system functionality into discrete, manageable components or features, aligning well with functional decomposition to organize system behavior.

Answer-31: A use case focuses on the interactions between the system and external entities, while a business process encompasses a broader set of activities and tasks within an organization.

Answer-32: Completeness is ensured through techniques like stakeholder review, prototyping, walkthroughs, and checking for all actors, flows, and scenarios.

Answer-33: In Agile development, use case diagrams are used to clarify user interactions and ensure that the system meets user requirements, guiding development and prioritization.

Answer-34: A use case describes interactions and scenarios in user/system behavior, while a functional specification outlines specific system functions and technical details.

Answer-35: In a distributed system, use case analysis includes identifying communication protocols, message flows, and error handling across distributed components and services.

Answer-36: Use cases help stakeholders visualize system functionality, ensuring that their requirements are correctly captured and that the design is aligned with their expectations.

Answer-37: The Basic Flow represents the standard or expected sequence of actions that take place during the execution of a use case under normal conditions.

Answer-38: An Alternative Flow describes deviations from the basic flow, outlining optional or exceptional actions and scenarios that may occur during use case execution.

Answer-39: Use cases help identify potential risks by describing interactions and boundary conditions, allowing teams to foresee and mitigate system failure points.

Answer-40: Challenges include managing large numbers of actors, handling complex workflows, ensuring consistency across use cases, and maintaining clarity while accommodating evolving requirements.

Answer-41: A user goal is the objective that the actor wants to achieve by interacting with the system, and each use case is typically defined around achieving one or more user goals.

Answer-42: Use case relationships like include and extend help identify dependencies, common behaviors, and optional scenarios, which optimize system design and ensure maintainability.

Answer-43: Use case analysis helps define system interactions, which guide architectural decisions regarding system components, modules, and interfaces.

Answer-44: In Agile, use cases evolve through iterative development, with continuous refinement based on user feedback, system testing, and changing requirements.

Answer-45: Use cases are validated through prototyping, walkthroughs, reviews with stakeholders, and testing the system against the defined flows and expected outcomes.

Answer-46: Use case analysis helps trace functional requirements to system behavior, providing traceability to ensure that all requirements are met during development.

Answer-47: A use case description includes the use case name, actors involved, preconditions, basic and alternative flows, postconditions, and exception handling.

Answer-48: Use cases contribute to quality assurance by ensuring that all system interactions are correctly defined, tested, and validated, reducing defects in system behavior.

Answer-49: Ambiguous requirements are clarified through stakeholder meetings, discussions, and by breaking down the requirements into smaller, more manageable parts.

Answer-50: Use cases guide the system?s deployment by ensuring that all functional requirements are met and that the system behaves as expected when users interact with it.