When a software development company gets a big project, it must split the project into smaller components so that it can apply the divide-and-conquer strategy. The final product is then created by integrating these smaller components. The general procedure for dividing the bigger project is by grouping requirements for a common feature together to form smaller projects. Each of these smaller projects then get assigned to a development team. Thus, each team works on delivering part of the larger final product:
Testing efforts for each of these projects starts with the testers creating test scenarios and test cases. The number and complexity of the test cases vary with the size, duration, complexity, testing tools utilized, and the testing strategy. The biggest challenge, however, is to segregate these test cases so that they're easily accessible and can be referred to or reused across projects or organization-wide. This is where the concept of test suites comes in handy.