System Analysis and Design
Unit testing is

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

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System Analysis and Design
Acceptance testing is

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

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System Analysis and Design
Direct-access organization

has records placed randomly throughout the file
uses an index for each key type
means storing records in contiguous blocks according to a key.
Stores records sequentially but uses an index to locate records

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System Analysis and Design
A square symbols

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

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