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

Multitasking
All of these
Parallel run
Multiprocessing
None of these

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System Analysis and Design
The approach used in top-down analysis and design is

to identify a top level function an d then create a hierarchy of lower-level modules and components.
all of the listed here
to prepare flow charts after programming has been completed
to identify the top level functions by combining many smaller components into a single entity

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