System Analysis and Design
Positive 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
Indexed-Sequential organization

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
has records placed randomly throughout the file

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