Structured systems analysis and design method: Difference between revisions

Revision as of 03:08, 5 December 2011

Revision as of 00:44, 9 December 2011

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*Current Services Description further composed of

*Current environment logical data structure (ERD)

*Context diagram ([[Data flow diagram|DFD]])

*Leveled set of [[Data flow diagram|DFDs]] for current logical system

*Full data dictionary including relationship between data stores and entities

To produce the models, the analyst works through the construction of the models as we have described. However, the first set of data-flow diagrams ([[Data flow diagram|DFDs]]) are the current physical model, that is, with full details of how the old system is implemented. The final version is the current logical model which is essentially the same as the current physical but with all reference to implementation removed together with any redundancies such as repetition of process or data.

In the process of preparing the models, the analyst will discover the information that makes up the users and requirements catalogs.