System Analysis and Design
Positive testing is

running the system with line data by the actual user
making sure that the new programs do in fact process certain transactions according to Specifications
testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate system

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System Analysis and Design
A Decision table

shows the decision paths
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.

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System Analysis and Design
A square symbols

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

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