System Analysis and Design
A Decision table

represents the information flow
gets an accurate picture of the system
shows the decision paths
documents rules, that select one or more actions, based on one or more conditions, from a set of possible conditions.

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System Analysis and Design
Indexed-Sequential organization

uses an index for each key type
stores records sequentially but uses an index to locate records
has records placed randomly throughout the file
means storing records in contiguous blocks according to a key

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