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

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

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System Analysis and Design
Acceptance testing is

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 systems
making sure that the new programs do in fact process certain transactions according to Specifications

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