What phase of the waterfall approach is involved when a program is tested with various inputs to ensure correct output?

The phase of the waterfall approach that involves testing a program with various inputs to ensure it produces correct outputs is the Testing phase. During this stage, software is rigorously evaluated to identify defects or bugs. The testing phase is crucial because it verifies that the program functions as intended and meets the specified requirements established during earlier phases, such as Analysis and Design.

In this phase, testers create test cases that include a variety of input scenarios, to validate that the outputs are accurate and consistent with the expected results. This process can include unit testing, integration testing, system testing, and acceptance testing, each focusing on different aspects of the software.

By concentrating on the Testing phase, developers ensure that the software is reliable and functions properly before it is moved to the next stage or delivered to users. This focus on validation helps to minimize the chances of errors going undetected, thus contributing to the overall quality and robustness of the final product.