System Analysis and Design
Conversion method in which users, being used to an old system, continue to use the old system, along with the new system, is

Multiprocessing
Parallel run
All of these
None of these
Multitasking

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System Analysis and Design
A couple:

None of these
means that the upper module has the capability of calling the lower module
None of these
is represented by a line joining two modules
is a data item that moves from one module to another

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