System Analysis and Design
A Decision table

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

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System Analysis and Design
An open rectangle

None of these
identifies data flow
defines a source or destination of system data
represents a process that transforms incoming data flow(s) into outgoing data flows
is a data store-data at rest, or a temporary repository of data

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System Analysis and Design
Indexed-Sequential organization

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
uses an index for each key type

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