System Analysis and Design
A Decision table

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

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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
means storing records in contiguous blocks according to a key
has records placed randomly throughout the file

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