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The transformation of life courses in industrialized countries since the mid-twentieth century can be analyzed through the lens of life course complexity, a function of the number of transitions or states experienced by individuals over a given time span. Life course complexity is often measured with composite indices in a static sequence analysis framework (i.e. over a single age interval), but this method has seldom been evaluated. This paper fills this gap. We review nine indicators of life course complexity and explore the advantages of a dynamic approach to sequence analysis (i.e. examining many nested or consecutive age intervals). An application to data on the partnership histories of American and French women is used to show the properties of each measure. We conclude that simple indicators, used alone or in combination, provide a more easily interpretable description of changes and differentials in life …