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Language testing is not done in a vacuum. Current approaches to test validation provide support to making justifiable decisions about test testers leading to (hopefully) beneficial consequences for society. Language testers are typically well-trained technically and experts in their particular disciplines. But what role does knowing how to apply a variety of quantitative and qualitative methods in the search for evidence to support claims play when in the public sphere it is often policy makers who drive the decision-making? In this paper, I illustrate a beneficial interplay between these various roles based on real-life experiences with the WIDA Consortium.