http://www.gamasutra.com/view/news/259479/Classic_Postmortem_The_making_of_HalfLife_2.php Half-Life 2 postmortem – design process, workflows. #PM https://uxplanet.org/how-to-measure-product-usability-with-the-system-usability-scale-sus-score-69f3875b858f System Usability Scale, an alternative to NPS. #UX https://en.wikipedia.org/wiki/Lanchester%27s_laws Law describing how two rival armies get smaller as they sustain casualties. #know