System Analysis and Design: Requirements Modeling Quiz

Requirements Modeling

• Requirements Modeling is a critical phase in the Software Development Life Cycle (SDLC), essential for defining and documenting the functions and constraints of a system.
• There are five key aspects of Requirements Modeling: Input, Process, Output, Performance, and Control.

Input

• Data and resources required for the system to function.
• Sources of input: User forms, external databases, sensors, APIs.
• Data Format: Text, numbers, dates, structured data like JSON or XML.
• Validation Rules: Ensure data correctness (e.g., mandatory fields, data type checks).
• Input Methods: User interfaces, API calls, batch uploads.

Process

• How the system manipulates input data to produce desired results.
• Algorithms: Computational steps (e.g., late fee calculation).
• Business Rules: Policies governing data processing (e.g., max number of books per member).
• Workflows: Sequence of steps (e.g., book issuance process).
• Data Storage and Retrieval: Database design and querying mechanisms.

Output

• Results produced by the system and their presentation.
• Output Formats: Reports, charts, files.
• Output Channels: Screen displays, printed reports, email notifications.
• Content: Data fields, structure.
• Frequency and Timing: Real-time, batch, scheduled intervals.

Performance

• Standards for the system’s efficiency and reliability.
• Response Time: Acceptable time for system responses.
• Throughput: System's capacity to handle work.
• Scalability: Ability to grow with increasing demands.
• Reliability: System uptime and availability.

Use Case Diagrams and DFDs

• Create comprehensive use case diagrams that accurately represent the interactions between system users and the software.
• Create DFDs to depict system processes, data flows, data stores, and external entities.
• DFD components: Processes, data flows, data stores, and external entities.
• DFD levels: Context, level 0, and detailed level DFDs.