System Analysis and Design
Sequential organization

means storing records in contiguous blocks according to a key.
None of these
uses an index for each key type
has records placed randomly throughout the file
Stores records sequentially but uses an index to locate records

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System Analysis and Design
Unit testing is

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

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