Feathers addresses the dual challenges of inferring original vessel counts from sherds and inference to use life from reconstructed vessels. His solution assumes the validity of sherd assemblages as units of observation that considerable research invalidates and overlooks methods that estimate original vessels from sherds. Feathers also doubts that use life can be inferred for reconstructed vessels. Although not a focus of my article, the larger study from which it derived addresses this matter in detail that strongly warrants vessel size as use-life measure. Of course we must be pragmatic in quantifying pottery assemblages, but first we must identify valid units of observation, and only then attend to pragmatics.

Shott (2022, American Antiquity 87:794–815) argues that making inferences from ceramic data requires first inferring use lives of vessels—something that is difficult to do. This comment argues that the problem of differential use life becomes more tractable if the assemblage, rather than the vessel, is the unit of analysis. Aside from empirical reasons, theoretical considerations also favor the assemblage as the appropriate unit.