Software Engineering – Structured Chart

Introduction

  • 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. 
    1. Structured flow chart
    2. HIPO include VTOC and IPO
    3. 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:
    1. Visual table of content (VTOC)
    2. Functional Diagram

Example (Online sales management system)

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Example (Functional Chart)

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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.

Example

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