Which tool is most commonly used in the standard improvement Define Measure Analyze Improve Control Define phase?

In the Define phase of the DMAIC (Define, Measure, Analyze, Improve, Control) framework, tools such as the Project Charter and SIPOC (Suppliers, Inputs, Process, Outputs, Customers) diagram are commonly used. The Project Charter helps to outline the project goals, scope, and stakeholders, while the SIPOC diagram provides a high-level overview of the process, clarifying key elements and relationships. These tools are essential for establishing a clear understanding of the project and ensuring all team members are aligned on objectives.