This method is very effective for saving time in the integration testing process. Below is the image of the big bang integration testing. What is the big bang testing in software engineering. In bottomup testing, each module at lower levels is tested. The requirements are understood and implemented as they come. For the love of physics walter lewin may 16, 2011 duration. In big bang integration all the four modules module a, module b, module c and module d are integrated simultaneously and then the testing is performed. Any changes required may or may not need to revamp the complete software. In the bigbang approach, most of the developed modules are coupled together to form a complete software system or major part of the system and then used for integration testing. Examples of integration testing big bang approach, incremental, top down, bottom up, sandwichhybrid, stub, driver. Software engineering integration testing geeksforgeeks. System testing chair for applied software engineering.