Without ethnography, cross-cultural comparison would not be possible. But without cross-cultural comparison, we would know nothing of what may be universal or variable across human cultures, or why variation exists. Cross-Cultural Research Methods is an introductory teaching tool that shows students and potential researchers how to describe, compare, and analyze patterns that occur in different cultures, that is, how to form and test anthropological, sociological, psychological, medical, or political hypotheses about cultural variation.