This document discusses several models of audience segmentation:
1) A Channel 4 quiz that places people into subcultures based on answers to questions about lifestyle and brand preferences. However, this is subjective.
2) Young & Rubicam asked about brands purchased and feelings, dividing people into 7 groups based on "core motivation." This acknowledges cultural influences but is reductionist.
3) YouGov Profiles uses data from 250,000 members to provide many audience segments like demographics and interests. This large sample increases validity and generalizability.