Copyright © 2013 Denis Larrivee, Adriana Gini. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Quality of life is fast becoming the standard measure of outcome in clinical trials, residential satisfaction, and educational achievement, to name several social settings, with the consequent proliferation of as-sessment instruments. Yet its interpretation and definition provoke widespread disagreement, thereby rendering the significance of quantification uncertain. Moreover, quality, or qualia, is philosophically dis-tinct from quantity, or quantitas, and so it is unclear how quant...