Big Bang
Approach:
In this
approach, all component are integrated together at once and then tested, this
approach convenient for small systems.
Incremental
Approach
In this
approach, testing is done by joining two or more modules that are logically
related. Then the other related modules are added and tested for the proper
functioning. The process continues until all of the modules are joined and
tested successfully.
Incremental
Approach, in turn, is carried out by two different Methods: Bottom Up, Top Down
Bottom-up Integration
In the
bottom-up strategy, each module at lower levels is tested with higher modules
until all modules are tested. It takes help of Drivers for testing
Top-down Integration:
In Top to
down approach, testing takes place from top to down following the control flow
of the software system.
Hybrid Integration
In the hybrid
strategy is a combination of Top Down and Bottom up approaches. Here, top
modules are tested with lower modules at the same time lower modules are
integrated with top modules and tested. This strategy makes use of stubs as
well as drivers.
