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.

Test your understanding of Requirements Modeling in the System Development Life Cycle (SDLC). Identify the key aspects of Requirements Model and its importance in system analysis and design.