Software quality is crucial for ensuring that programs work correctly. Testing software can be challenging because it's not something physical that can be easily measured. This article introduces a new method called interface-based software testing, which aims to improve how we test software quality. By focusing on the software's interface, this technique helps automate testing, encourages testing early in the development process, and makes software easier to test overall. This approach can help prevent common issues like starting testing too late or not understanding the software's structure.