This document discusses different levels of market segmentation from mass marketing to niche marketing. It identifies the bases for segmenting consumer markets including geographic, demographic, psychographic, and behavioral factors. The requirements for effective segmentation are that segments must be measurable, accessible, substantial, and differential. Advantages of segmentation include guiding marketing research, improving satisfaction and forecasting, and identifying competition and opportunities. Disadvantages include increasing marketing costs, proliferation of products, potential consumer backlash, and limits on general popularity.