System Analysis and Design
Sequential or series testing is

testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate system
running the system with line data by the actual user
making sure that the new programs do in fact process certain transactions according to Specifications

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System Analysis and Design
A square symbols

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

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