What are the primary requirements for effective market segmentation?

What will be an ideal response?

To be useful, market segments must be:
1. Measurable: The size, purchasing power, and profiles of the segments can be measured.
2. Accessible: The market segments can be effectively reached and served.
3. Substantial: The market segments are large or profitable enough to serve. A segment should be the largest possible homogeneous group worth pursuing with a tailored marketing program.
4. Differentiable: The segments are conceptually distinguishable and respond differently to different marketing mix elements and programs. If men and women respond similarly to marketing efforts for soft drinks, they do not constitute separate segments.
5. Actionable: Effective programs can be designed for attracting and serving the segments.