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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.
This strategy includes testing the classes as they are integrated into the system. The traditional approach would test every operation separately as they are executed into a class.
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Usability testing is testing of 'user-friendliness'. User interviews, surveys, video recording of user sessions and other methods can be used. Programmers and developers are usuall
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