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Jackson Structured Diagrams

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1 Jackson Structured Diagrams
Programming Concepts Jackson Structured Diagrams

2 Jackson Structured Diagrams
This is a useful way of representing the structure of a program, when a program is large and complex, it is important to plan out the solution before attempting to write any program code. By using a Jackson structured diagram your system can be documented and given to a programmer to aid the development of the program.

3 Jackson Structured Diagrams
The basic structure to a JSD is as follows: It resembles a family tree, with the main modules being written across the top line. You read it from left to right completing any sub branches before being able to move on to the next module. JSD structures programs and data in terms of sequences, iterations and selections. Program Jackson Initialise InputAndProcess Output

4 Jackson Structured Diagrams Example - Loop
b = 10 Do While (a<b) a = a + 1 Loop To represent a Loop using JSD: Calculate result* Initialise InputAndProcess Output Do While (a<b)

5 Jackson Structured Diagrams Example - Selection
To represent Selection using JSD: Check if A >B If (A>B) Then Msgbox (“A is > B”) True Msgbox (“B is > A”) False

6 Jackson Structured Diagrams
JSD is a structured analysis and design method similar to SSADM. It uses Entity Structure Diagrams (ESD) and Network Diagrams (ND) to model a system.


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