Requirements Engineering Overview
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Questions and Answers

Which of the following are classifications of software requirements? (Select all that apply)

  • Technical Requirements
  • Domain Requirements (correct)
  • Non-functional Requirements (correct)
  • Functional Requirements (correct)
  • Which requirement specifies the technical characteristics of the software system?

  • System Requirements (correct)
  • Business Requirements
  • User Requirements
  • Regulatory Requirements
  • Non-functional requirements describe what the software should do.

    False

    Which of the following is NOT a classification of software requirements?

    <p>Technical Requirements</p> Signup and view all the answers

    Which example describes a functional requirement?

    <p>The system must allow users to log in using a username and password.</p> Signup and view all the answers

    Non-functional requirements describe what the software should do.

    <p>False</p> Signup and view all the answers

    Which of the following is an example of a non-functional requirement?

    <p>The system should process 1,000 transactions per second.</p> Signup and view all the answers

    Which type of requirement describes the business goals a software system aims to achieve?

    <p>Business Requirements</p> Signup and view all the answers

    Study Notes

    Requirements Engineering

    • Requirements engineering is a critical step in software development.
    • It involves creating and documenting requirements.
    • Activities include elicitation, specification, analysis, verification, validation, and management.
    • The process ensures the system benefits the organization, reflects client desires, and is in a standardized format.

    Classifications of Software Requirements

    • System requirements are statements of what a system must do to meet stakeholder needs.
    • These needs are derived from business and user requirements.
    • Requirements can be obvious, hidden, known, unknown, expected, or unexpected.
    • Software requirements are categorized into three types: functional, non-functional, and domain.

    Functional Requirements

    • Define what the software should do.
    • Describe functions or features.
    • Example: User authentication—the system must allow users to log in using a username and password.
    • Example: Search functionality—the software allows users to search for products by name or category.

    Non-functional Requirements

    • Describe how the software performs a task.
    • Define quality attributes, performance criteria, and constraints.
    • Examples:
      • Performance: The system should process 1,000 transactions per second.
      • Usability: The software should be easy to use and have a user-friendly interface.
      • Reliability: The system must have 99.9% uptime.
      • Security: Data must be encrypted during transmission and storage.

    Domain Requirements

    • Specific to the industry or domain.
    • Include terminology, rules, and standards.
    • Example: Healthcare—the software must comply with HIPAA regulations for handling patient data.

    Other Requirement Classifications

    • User requirements: Describe what end-users want from the system, expressed in natural language, usually through interviews, surveys, or user feedback.
    • System requirements: Define technical characteristics like architecture, hardware, and interfaces, expressed in technical terms.
    • Business requirements: Detail business goals and objectives for the software system.
    • Regulatory requirements: Include legal or regulatory standards the software must meet, such as data privacy, security, and accessibility.
    • Interface requirements: Specify interactions between the system and external components like databases, web services, or other software applications.
    • Design requirements: Detail the software architecture, data structures, algorithms, and other technical aspects.

    Software Requirements Specifications (SRS)

    • The output of the requirements specification stage.
    • It documents requirements clearly, concisely, and unambiguously.

    Qualities of a good SRS

    • Correctness: Includes all needed functionality.
    • Completeness: Includes all essential requirements (functionality, performance, design, constraints, attributes, external interfaces) and definitions, input data categories, diagrams, and units of measure.
    • Consistency: No conflicting requirements subsets.
    • Unambiguousness: Each requirement should have a single meaning.
    • Modifiability: The SRS should be adaptable to changes.
    • Verifiability: SRS details allow verification of the final software.
    • Traceability: Clear origin of requirements and linkage to other aspects.
    • Design Independence: Options for various design alternatives.
    • Testability: Requirements should be easily transformed into test cases.

    Advantages of Classifying Requirements

    • Better organization and management.
    • Easier communication and collaboration.
    • Improved quality due to early identification of conflicts.
    • Effective traceability for demonstrating compliance.

    Disadvantages of Classifying Requirements

    • Complexity;
    • Rigid structure limiting adaptability to change:
    • Incorrect classifications leading to errors.

    Requirements Engineering Process (RE)

    • Identifies, elicits, analyzes, specifies, validates, and manages stakeholder needs.
    • Crucial for project success;
    • Stakeholder needs are met within budget, quality, and time.

    Stages of Requirements Engineering

    • Elicitation: Gathering requirements from various stakeholders.
    • Analysis: Evaluating feasibility, consistency, and completeness of gathered requirements and resolutions of conflicts or contradictions.
    • Modeling: Understanding system behavior by using diagrams.
    • Specification: Documenting the requirements unambiguously and clearly.
    • Validation: Ensuring accuracy, completeness, and consistency of the requirements.
    • Management: Controlling changes and ensuring the requirements remain valid throughout the software development lifecycle.

    Requirement Validation Techniques

    • Test case generation: Creates tests to check requirements.
    • Prototyping: Presents a working model to validate customer needs.
    • Requirements reviews: Collective review by a group to identify errors and ambiguities.
    • Automated consistency analysis: Automatically detects inconsistencies and errors.
    • Simulation: Replicates real-world scenarios to verify requirements.
    • Checklists for validation: Methodical verification of requirements.

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    Description

    This quiz explores the critical step of requirements engineering in software development. It includes the classification of software requirements, focusing on functional, non-functional, and domain aspects. Test your understanding of how to document and manage requirements effectively.

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