Discuss the testing phase of the systems development life cycle

What will be an ideal response?

Testing goes on during the development phase, as individual modules are completed. When the system has been completed, it undergoes much more rigorous testing to ensure that the whole system works smoothly together, not just its individual modules. Each test mimics events the system will handle when it goes live. The test cases are carefully documented so the developers can make corrections in case of any failures. Software tools help tremendously with this testing as well. Once developers create a library of test cases, software tools can automatically run them against the system as it evolves to test for errors. The tools can simulate an army of customers, simultaneously trying to complete a web-based form with different data, different input errors, different browsers, and different expected outcomes. Some software tools can check for security holes, compliance with accessibility regulations, performance under loads, broken web links, and more.