System Analysis and Design
A square symbols

represents a process that transforms incoming data flow(s) into outgoing data flows
defines a source or destination of system data
None of these
is a data store-data at rest, or a temporary repository of data
identifies data flow

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System Analysis and Design
Unit testing is

running the system with line data by the actual user
is checking the logic of one or more programs in the candidate system
None of these
testing changes made in an existing or a new program
making sure that the new programs do in fact process certain transactions according to Specifications

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