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When would you choose bottom up methodology?

Real-Time Operating System (RTOS) Interview Question
Real-Time Operating System (RTOS) Interview Question

Answer:

In Bottom Up Methodology, we build the bottom-most layer
first and then ascend onto the actual application i.e. all
the smaller chunks of code or assisting functions are build
first and then the bigger function which uses these are built.

Bottom Up methodology is followed when we are definite about
the number, type and functionality of the Bottom most
functions(Assisting Functions) to be defined. Once all these
functions are defined, we build the bigger system above it.

Top down approach is followed when we are not very sure
about the number/type of functions that need to be
implemented, so the application is started to be implemented
and as and when smaller functions are needed, they are built.

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