System Analysis and Design
Sequential or series 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
running the system with line data by the actual user
testing changes made in an existing or a new program

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System Analysis and Design
Direct-access organization

means storing records in contiguous blocks according to a key.
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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