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The evolution of AGB stars is notoriously complex. The confrontation of AGBpopulation models with observed stellar populations is a useful alternative tothe detailed study of individual stars in efforts to converge towards areliable evolution theory. I review here the impact of studies of star clusterson AGB models and AGB population synthesis, deliberately leaving out any morecomplex stellar populations. Over the last 10 years, despite much effort, theabsolute uncertainties in the predictions of the light emitted by intermediateage populations have not been reduced to a satisfactory level. Observationalsample definitions, as well as the combination of the natural variance in AGBproperties with small number statistics, are largely responsible for thissituation. There is hope that the constraints may soon become strong enough,thanks to large unbiased surveys of star clusters, resolved colour-magnitudediagrams, and new analysis methods that can account for the stochastic natureof AGB populations in clusters.

Integrated Properties of AGB Stars in Unresolved Stellar Populations: Simple Stellar Populations and Star Clusters