- Structured design partitions a program into small independent modules.
- Structure chart is a chart derived from Data Flow Diagram.
- The structure chart represents the hierarchical structure of modules. At each layer, a specific task is performed.
- In the structured design following, charting tools are used.
- Structured flow chart
- HIPO include VTOC and IPO
- Warnier – Orr diagrams
Structured Flow chart
- These are also known as Nassi – Schneider man charts.
- There are three basic elements: Process, decision, and iteration.
- They are used by system analysts to combine function diagrams and data flow diagrams.
- They show the flow of data and flow control of data.
Structured Chart – HIPO chart
- HIPO stands for Hierarchical Input Process Output
- It is a combination of two organized methods to analyze the system and provide the means of documentation.
- It is a commonly used tool for developing system software.
- They are used in documenting information. It was first developed by IBM as a design aid.
- The components of the HIPO package are:
- Visual table of content (VTOC)
- Functional Diagram
Example (Online sales management system)
Example (Functional Chart)
Structured Chart – Warnier – Orr Diagram
- Warnier diagram was first developed by Jean – Dominique warier, a Belgian mathematician, and later extended by Kenneth Orr, an American.
- It represents a process, decision, and iteration.
- It is very useful to describe complex processes.