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SSADM Structured System Analysis

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SSADM Structured Systems Analysis and Design Methodology

Structured Systems Analysis and Design Method (SSADM) is the method which is used at projecting and analysis of information systems. This method was developed for government of Great Britain in the beginning of 80th of the past century. It was accepted as the national standard of Great Britain for information systems development in 1993. Thus SSADM usage is expedient for those who work with governmental organizations as this method is a standard for these organizations.

Unlike the Conventional Approach SSADM is DATA driven:

Assumptions:

* business methods change often

* IS processes will need to reflect changes

* Underlying data in the system changes very little

Data modelling …show more content…

This allows project management tools to be used alongside the methodology. SSADM specifies exactly the flows and tasks of a development project and produces a detailed documentation of the project. In recent versions the emphasis on data has been balanced by focussing more on the user’s needs.

Feasibility: this stage is concerned with ensuring that the project which has been suggested in planning is feasible, that is, it is technically possible and the benefits of the information system will outweigh the cost.

The second module, requirements analysis, has 2 stages: the investigation of current requirements and business system options. Business systems options are the stage where the functionality of the new system is determined and agreed. At this stage those requirements which are cost-justified are carried forward and specified in greater detail. The option chosen is documented in detail and agreed as the basis of the system specification which is the next stage. DFDs and ERMs are developed but this stage is largely a specification in narrative.

Definition of requirements: leads to the full requirements specification and provides clear guidance to the design stages which follow - the engine room of SSADM where investigation and analysis are replaced by specification and …show more content…

These points are essential to deliver the product on time. Usability: Within SSADM special emphasis is put on the analysis of user needs. Simultaneously, the systems model is developed and a comprehensive demand analysis is carried out. Both are tried to see if they are well suited to each other. Respond to changes in the business environment: As in SSADM documentation of the project’s progress is taken very seriously, issues like business objectives and business needs are considered while the project is being developed. This offers the possibility to tailor the planning of the project to the actual requirements of the

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