In which phase are best practices often documented for future use?

The best practices are typically documented in the Control phase. This phase is crucial as it ensures that the improvements made during the project are sustained over time. By documenting best practices, organizations can create a reference for future projects and maintain the gains achieved. This documentation serves as a guide for standard operating procedures, helping to prevent regression to previous performance levels and ensuring consistent quality.

While the other phases contribute to the overall process improvement, they do not primarily focus on the long-term sustainability and documentation of best practices. For instance, the Define phase is about identifying the problem and setting project goals, the Measure phase involves gathering data to understand current performance, and the Improve phase focuses on developing and implementing solutions. Each of these phases is essential, but the Control phase specifically emphasizes the importance of documenting and institutionalizing best practices for continuous improvement.