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

All of these
Multiprocessing
None of these
Multitasking
Parallel run

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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 identify the top level functions by combining many smaller components into a single entity
to prepare flow charts after programming has been completed

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System Analysis and Design
A square symbols

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

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