To assure the process will continue to achieve expected results, it's important to monitor...

Critical Y's (output-process variables) that were proven to be effected by the defects.

Critical X's (in-process variables) that were proven to cause the effect.

All x's (input-process variables) that were proven to cause an effect.

Your operations Manager asked you to review the Value Stream Map and identify bottlenecks. Bottlenecks are found by

Identifying which process-step is underutilized.

Identifying the lowest level of inventory in-between steps.

identifying the process step with a cycle time equal to the Takt-time

Identifying the process step with the greatest amount of WIP (work-in-process) before it.

All Y's (output-process variables) that were proven to be effected by the defects