The most critical activity for reducing the impact caused by IT staff turnover is to document processes and procedures, as this can help preserve the knowledge and experience of the existing IT staff, as well as facilitate the training and orientation of the new IT staff. Documenting processes and procedures can also help standardize and improve the quality and efficiency of IT operations, services, and projects, as well as ensure compliance with regulations and policies. Documenting processes and procedures can also help define and clarify the roles and responsibilities of the IT staff, as well as the expectations and requirements of the business units.

Outsourcing the IT operation, increasing compensation for IT staff, and hiring temporary staff are possible activities for addressing the IT staff turnover issue, but they are not the most critical activity. Outsourcing the IT operation may reduce the dependency on internal IT staff, but it may also introduce new risks and challenges for IT governance and management, such as vendor selection, contract negotiation, service level agreement (SLA) monitoring, and data security. Increasing compensation for IT staff may improve the retention and motivation of the existing IT staff, but it may also increase the operational costs and budget constraints of the IT department. Hiring temporary staff may fill the gaps or shortages in IT skills or resources, but it may also affect the continuity and consistency of IT service delivery, as well as the integration and collaboration of IT teams.