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Systems Analysis Methodologies

Bernie Fishpool

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Methodologies SSADM Soft Systems/Multiview Information Engineering Yourdon Structured Method Merise RAD (Rapid Applications Development) UML

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SSADM Low level of structuredness Has a medium requirement for user

involvement in the process Is usually applied to LARGE potential

systems

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Soft Systems/Multiview Low in terms of it’s structuredness High to medium level of user

involvement Aimed at SMALL projects

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Information Engineering High level of structuredness Medium level of user involvement Aimed at LARGE systems

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Yourdon Structured Method Medium structuredness Low to medium level of user

involvement Can be applied to any size of

potential system

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MERISE High level of structuredness Has a medium requirement for user

involvement Aimed at large systems

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HOW THEY COMPARE:Business Strategy PlanningInformation Strategy Planning

Information Engineering

Merise

Feasibility Study

Structured Systems Analysis and Design (SSADM)

Yourdon Structured Method

Systems Analysis Soft

Systems/MultiviewSystem Design

Program Coding

Module Testing

System Integration and TestImplementation

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How they compare Apart from MERISE they all use

dataflow diagramming as a tool All methods use Entity Modelling All methods use Normalisation All methods formally include

Prototyping

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How they compare SSADM and Yourdon use Structure

diagrams/charts SSADM, IE, Yourdon and MERISE

break down a problem by using progressively lower level diagrams to model the situation

Apart from notation, application of diagrams is the same

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Post Analysis……….. RAD (Rapid Applications

Development)

UML (Unified Modeling Language)

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RAD (Rapid Applications Development) A development methodology

that relies on prototypes, working or experimental models of a system.

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RAD (Rapid Applications Development)1. Define the problem and identify

system requirements2. Build the initial prototype3. Use the prototype to refine

existing requirements4. Revise and enhance the prototype

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RAD (Rapid Applications Development) Well suited for noncritical (or

generic) applications such as word processing, financial analysis, inventory control, scheduling project management

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RAD (Rapid Applications Development) Low in terms of its structuredness High level of user involvement in

the process

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UML (Unified Modeling Language) It is methodology-independent. Regardless of

the methodology that you use to perform your analysis and design, you can use UML to express the results.

Modeling is the only way to visualize your design and check it against requirements before your crew starts to code

Structural Diagrams include the Class Diagram, Object Diagram, Component Diagram, and Deployment Diagram