Which of the following is NOT a step in the Testing phase of Systems Development?

The Testing phase of Systems Development is essential for ensuring that the system works as intended before it is deployed. Each of the steps in this phase serves a distinct purpose in validating various aspects of the system.

Unit Testing focuses on verifying the smallest individual components or pieces of code within the application to ensure they function correctly on their own. System Testing involves testing the complete and integrated software to evaluate its compliance with specified requirements. Acceptance Testing, often performed by end users, assesses whether the system meets the agreed-upon criteria and is ready for deployment in the real-world environment.

Integration Testing, which was identified as the incorrect choice in this context, is indeed a critical step in the Testing phase. It aims to validate the interactions and data flow between integrated components, ensuring that they work together as intended.

Thus, the correct answer highlights that Integration Testing is truly a necessary component of the Testing phase, while all the other options are valid testing steps that are crucial for effective system validation.