System Analysis and Design
Main characteristic of "ring", in Data structure, is

First record points only to the last record
Each record points to all other records
Last record points to the first record
Many records point to one record

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System Analysis and Design
Positive testing is

testing changes made in an existing or a new program
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 system
running the system with line data by the actual user

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