System Analysis and Design
Top-down programming is

a map of the programmer's view of the data
a group of related fields
an approach in which the top module is first tested then program modules are added from the highest level to the lowest level
a series or group of components that perform one or more operations of a more complex system

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System Analysis and Design
A Decision table

gets an accurate picture of the system
represents the information flow
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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