Answer / manish1808

Integration testing is mainly of 2 types-big bang approach
and incremental approach.
In Big Bang Approach all modules of the application are
integrated together and then tested.In incremental approach,
modules are added one by one using top-down approach or
bottom-up approach or sometimes a mix type of approach is
used called sandwitch integration.In top down
approach,integration starts from the main module and then
sub modules are added in depth first or breadth first
manner....(i hope u guys know that).As all other modules
are not available...dummy modules are used which are called
stubs....In bottom-up approach integration starts from the
lowest level and as the processing required from the
subsequent level is already available,stubs are not reqd.
but main module is not there...hence driver is used which
is a dummy main module.

Answer / monisha

Top-down approach develops a model of information flow that acts as a guide for designing the information system.By using the model,the information subsystem may be prepared or defined.Each subsystem comprises of various modules.The various subsystem and the modules are coordinated to achieve the objectives of integration.The information system so developed is viewed as total system.

Bottom-down approach starts from the identification of life-stream systems and file requirements as well as processing program for life stream developed.Second step is towards the integration of data kept in different data files of each information system ensuring that the uniform data is being used by all programs.Third step is the addition of decision models and various planning models for supporting the planning activities involved in management fields.

Answer / veeraraju

Top down approach is nothing but a stubs or Dummy module....Stubs means we assume something is there but it is not vissible.................

Example:-

Yahoo(Highest level module)

Mail:- News:-
Inbox Entertainment
sent mail National
Junk International
Draft Business

In this example yahoo is having different sub modules like mail and news..so yahoo is the highest module compare to mail and news.....
not only a yahoo is highest module..... mail is also highest module compare to sub modules in mail........like mail is highest module compare to draft
so mail is lowest module as well as highest module
it depends on the comparison.......


Note:- this is the first time i am posting.......plz correct it if any modifications is here........

Answer / bishwajit.rk

Well said Manish1808. Bravo!!!

Answer / vijaya

what manish given is correct ans
Suresh u gave the wrong ans, totally it is wrong..
If u dont know the ans dont post it.
dont give wrong guidence to freshers.

Answer / abdul

Manish...U have Given such a good Ans as the concept is
clear for always...

Keep doing so.:-)

Answer / suresh.ch

Top down:
Testing starts from UAT, SRS, FS, Design, Coding which are
includes system testing after that functional testing after
that integration then unit testing.
Bottom UP:
Testing from bottom to top that is first unit then
integration then functional then system then verify it is
according to UAT.

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