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The use of high-quality simulated sky catalogs is essential for the successof cosmological surveys. The catalogs have diverse applications, such asinvestigating signatures of fundamental physics in cosmological observables,understanding the effect of systematic uncertainties on measured signals andtesting mitigation strategies for reducing these uncertainties, aiding analysispipeline development and testing, and survey strategy optimization. The list ofapplications is growing with improvements in the quality of the catalogs andthe details that they can provide. Given the importance of simulated catalogs,it is critical to provide rigorous validation protocols that enable bothcatalog providers and users to assess the quality of the catalogs in astraightforward and comprehensive way. For this purpose, we have developed theDESCQA framework for the Large Synoptic Survey Telescope Dark Energy ScienceCollaboration as well as for the broader community. The goal of DESCQA is toenable the inspection, validation, and comparison of an inhomogeneous set ofsynthetic catalogs via the provision of a common interface within an automatedframework. In this paper, we present the design concept and firstimplementation of DESCQA. In order to establish and demonstrate its fullfunctionality we use a set of interim catalogs and validation tests. Wehighlight several important aspects, both technical and scientific, thatrequire thoughtful consideration when designing a validation framework,including validation metrics and how these metrics impose requirements on thesynthetic sky catalogs.

DESCQA: An Automated Validation Framework for Synthetic Sky Catalogs