1.Top down - within a period of time, minimal demoable product is made.After each successive period more and more features is added.So at each interval demoable
product is present.Progress is measurable at each interval.Design changes doesnt waste effort too much.
2.Bottom up - First demoable product takes time.multiple units work parallelly to
develop all the features.Integration and testing takes time.After the first stage things will be fast.The design has to be perfect from start otherwise the work done
will be void.
3.For TD approach, first interval will have the framework ready with few features.
Rest of the system development will fall into placeholders of the framework.
4.For time estimation - When deciding to add a feature or modify a feature,find how many .c files .h files will be affected,how many functions will be affected, if it
spans across 5 files and 5 functions it will defenitely take 1 day cycle of modification,review,testing.If its a new feature addition again idea has to be gathered for its imapact on the number of .c and .h files and code addition,review,testing cycle,again for (5,5) it will take around 2 days(because of white space filling code addition).
5.types of modification - no data structure addition/deletion with code changes,data structure addition/deletion with code changes
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