A dedicated validation of new Monte Carlo (MC) versions is essential in order to detect potential issues before launching large-scale MC production campaigns for the ATLAS collaboration in an effective and sustainable way. An automated, robust validation system named Physics Modeling Group Architecture for Validating Evgen with Rivet (PAVER) was developed for this purpose. Accessible via a web interface, PAVER allows for regular evaluations of new revisions and updates for commonly used MC generators, alongside comparisons to measured data. The validation workflow in ATLAS using the PAVER system is detailed here.