Software Engineering - Structured Analysis & Design Techniques
The chapter thoroughly explores Structured Analysis and Design methodologies, focusing on the creation and use of Data Flow Diagrams (DFDs) and Structure Charts in software engineering. It emphasizes the sequential transformation of system requirements into organized software structures through these visual models, highlighting the importance of DFD Balancing and decomposition processes. Common modeling errors and best practices for effective design are addressed alongside practical examples for real-world application.
Sections
Navigate through the learning materials and practice exercises.
What we have learnt
- Data Flow Diagrams (DFDs) are essential for illustrating the flow of data within a system and capturing functional requirements.
- Structured Design techniques, namely Transform Analysis and Transaction Analysis, provide systematic methodologies for deriving robust software architectures from DFDs.
- High cohesion within modules and low coupling between them are critical principles for maintaining software quality, enabling easier maintenance and scalability.
Key Concepts
- -- Data Flow Diagram (DFD)
- A graphical representation that depicts the flow of data within a system, illustrating how data enters, is processed, and exits the system.
- -- DFD Balancing
- A fundamental principle that ensures consistency of data flows between different levels of DFDs, maintaining the integrity of data as the context of the processes evolves.
- -- Transform Analysis
- A structured approach used to derive a hierarchical Structure Chart from a DFD, focusing on a clear flow of input, processing, and output stages.
- -- Transaction Analysis
- A method applied to systems characterized by various transactions, wherein a centralized transaction center dispatches control to specific action modules based on the transaction type.
- -- Coupling and Cohesion
- Modular design principles advocating for high cohesion within modules (single, defined responsibilities) and low coupling between modules (minimal interdependencies).
Additional Learning Materials
Supplementary resources to enhance your learning experience.