You are using the critical chain solution to construct your schedule, and there are variances in your critical path tasks. Which of the following is correct?
If the critical path tasks have variances, your schedule is at risk. You will use corrective actions at this point (not preventive actions) to get the project back on track, such as adjusting the amount of buffer. Significant delays to noncritical-path tasks can make them become part of the critical path.