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Structured Design Methodologies
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Conclusion
Structured Design Methodologies
There you have your introduction to structured design methodologies.
In this topic we will continue to explore further about the waterfall and parallel development methodologies looking closely at the different phases of the models and how they are used in the real world today,
Processes and Data
Traditional structured design uses one set of diagrams to represent the processes and a separate set of diagrams to represent the data.
As two sets of models are used the systems analyst must decide which set to use first and use as the core of the system. since each type of model is important to the system there is much debate over whether to emphasize processes before data and vice versa.
Parallel Development
Parallel adoption is a method for transferring between an previous (IT) system to a target (IT) system in an organization.
In order to reduce risk, the old and new system run simultaneously for some period of time after which, If the criteria for the new system are met, the old system is disabled. The process requires careful planning and control and a significant investment in labour hours.
Models
Numerous process-centered and data-centered methodologies follow the basic approach of the two structured design categories.
The two most famous structured design methodologies are 'Waterfall Development' and 'Parallel Development'
Waterfall Development
History
The waterfall model is a sequential design process, Often used in software development processes, in which progress is seen as flowing steadily downwards (like a waterfall) through the phases of Conception, Initiation, Analysis, Design, Construction, Testing, Production/Implementation, and Maintenance.
These methodologies became dominant in the 1980's, replacing previous ad hoc and undisciplined approaches.
Structured Design Methodologies adopt a formal step by step approach to SDLC that moves logically from one phase to the next.
This category of methodology also introduced the use of formal modelling or diagramming techniques to describe a systems basic business processes and the data that supports them.