Performance reviews are a tool and technique used in control schedule and includes trend analysis, critical path method, critical chain method, and earned value management. In terms of the critical path method, the emphasis is on comparing progress along the critical path to determine schedule status. Variance on the critical path will have a direct impact on the project's end date; evaluating progress of activities or near critical paths can identify schedule risk. After the variance is known, the project team can take corrective action to bring performance in line with the plan.