Résumé
With the increased application of geometric morphometric approaches, different protocols for the same bone and species have been published. We attested this on the 8th ICAZ AGPM Working Group meeting (Paris, 2019) in which we presented together three different landmark protocols to study sheep astragalar phenotypic variability and more protocols have been appearing since then. Therefore, there is a growing necessity to standardize the protocols and also to properly investigate the biological variables that are captured on this bone. In this paper we present our first attempts at identifying an optimal protocol for measuring the sheep (Ovis aries) astragalus while also controlling for variation between acquisition technology, two- and three-dimensional recording, and interoperator variation.