Introduction to Elements of the Analysis Model
The analysis model must achieve the primary objective:
To meet this objective the analysis model derived from structural analysis takes the form as shown in fig4.1.
This analysis model consists of:
Data dictionary forms the core of the models and contains the description of all the data objects that have been defined or concerned with the software. Data dictionary is surrounded by three different kinds of diagram. Entity relationship diagram describes how the various data objects are related to each other. ERD is used to conduct the data modelling activity and is concerned with defining the various attributes of properties of data objects. Data Flow diagrams describes both the function that are used to transform a data into some other form (may be output) and the way the data is transformed from input to output. It serves as a basis for functional modelling. Process specification contains the description of every functional modules defined in the DFD. State transition diagram describes how the system behaves to external events. It can be a decision making, step. It represents the various modes of the behaviour (called states) and the way in which system transits from on estate to another. Control specification holds the additional information regarding the control aspects of the software responsible for various state transitions. And data objects description provides the complete knowledge about a data object.
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