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Explain about the E-R Diagram
Entity-relationship (E-R) diagram is detailed logical representation of data for an organisation. It is data oriented model of a system while DFD is a process oriented model. ER diagram represent data at rest whereas DFD tracks the motion of data.
ERD doesn't provide any information regarding functionality of data. It has 3 main components - data entities, their relationships and their associated attributes.
notation of requirement of specification
A measure of the severity and probability of undesired effects. Often taken as the easy product of probability and consequence.
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Categories of software maintenance There are three categories of maintenance: i) Corrective Maintenance ii) Adaptive Maintenance iii) Perfective Maintenance
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