System Analysis and Design
The reservation system of Indian railways is an example of

Interactive decision support system
transaction processing system
None of these
management controls system
expert system

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System Analysis and Design
A Decision table

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

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System Analysis and Design
In top down analyis and design

each succeeding phase is less detailed than the phase before it
all of the listed here
each succeeding phase is more detailed than the phase before it
each succeeding phase is as detailed as the phase before it.

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