The purpose of the define phase is to

• Identify and select projects (business case),

• Define the problem clearly that identifies customer requirements and the characteristics those are critical to quality (CTQ) from customers’ perspective,

• Outline the objectives and measurable,

• Justify the project,

• Address the voice of customer (VOC),

• Address the cost/revenue implications, and

• Identify and define the improvement opportunities

The selection of project is performed under the direction and participation of the champion, master black belts, or black belts.