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The functionality of the underlying modules is simulated with stubs. The top module is integrated with the lower level module stub one by one and later the functionality is tested.
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SIT is required to expose the faults that occur when interaction happens between the integrated sub-systems.Validate the constraints and data validation rules applied in the database as per business specifications.
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Confirmation tests at this level will identify environment-specific problems, such as errors in memory allocation and de-allocation. The practicality of conducting software integration in the host environment will depend on how much target specific functionality is there. For some embedded systems the coupling with the target environment will be very strong, making it impractical to conduct software integration in the host environment.
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The "function follows form" principle is applied as an overarching framework to focus the application SIT's thinking tools. Once each test is completed, the stub is replaced by the real module. The modules can be integrated either in a breadth-first manner or a depth-first manner. The test continues until the whole application is built.
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This organized or structured approach to idea generation is the starting point for Systematic Inventive Thinking.  The TRIZ heritage [ edit ]The process continues from step2 until the entire program structure is built. The top-down strategy sounds relatively uncomplicated, but in practice, logistical problems arise. i) Intra-System Testing: This is a low level of integration testing that aims at fusing the modules together to build a unified system.