Observing Interaction: An Introduction to Sequential AnalysisMothers and infants exchanging gleeful vocalizations, married couples discussing their problems, children playing, birds courting, and monkeys fighting all have this in common: their interactions unfold over time. Almost anyone who is interested can observe and describe such phenomena. However, scientists usually demand more than a desription they want observations that are replicable and amenable to scientific analysis, while still faithful to the