Final answer:
The pair of criteria not included in the six criteria for IT project success as identified by DeLone and McLean is Level of integration and System maintainability.
Step-by-step explanation:
The pair of criteria not included in the six criteria for IT project success as identified by DeLone and McLean is Level of integration and System maintainability. The six criteria for IT project success, identified by DeLone and McLean, are Information quality, User satisfaction, Individual impact, System quality, Use, and Organizational impact. These criteria are used to evaluate the success of an IT project based on different aspects such as user satisfaction, system quality, and organizational impact.