Which phase of DMAIC is designed to ensure that the problem does not reoccur and that the new process can be further improved over time?

The phase of DMAIC designed to ensure that the problem does not reoccur and that the new process can be further improved over time is the "Control" phase. In this phase, controls are put in place to monitor the process and ensure that improvements are sustained. It also involves developing standard operating procedures and training to maintain the gains achieved. Continuous improvement practices are encouraged to identify further enhancements.