When a risk occurs, whether anticipated or not, respond promptly. If there is a contingency plan established for the problem, begin its execution as soon as practical.
For risks that were passively accepted or are unexpected, involve the project team members in the response planning.
Develop a response to the risk using techniques for schedule control and cost control, and attempt to recover quickly. Seek workarounds and ad hoc responses that are consistent with your project infrastructure decisions.
If major changes are necessary, validate the response using integrated change control processes before committing to it. Discuss any major changes with the project sponsor and appropriate stakeholders. If necessary, use problem escalation ...