IQOQ is a critical step in system testing and system validation processes. The Installation Qualification (IQ) verifies that the software is installed correctly and meets all specified requirements. On the other hand, the Operational Qualification (OQ) verifies that the system functions as expected in its operational environment.

By conducting IQOQ tests, software testers can ensure that the system meets all necessary criteria for proper installation and operation. This helps to prevent potential issues and ensures the reliability and functionality of the software system.