See also their presentation https://valvearchive.com/archive/Other%20Files/Publications/GDC2009_ValvesApproachToPlaytesting.pdf https://valvearchive.com/archive

See also their presentation https://valvearchive.com/archive/Other%20Files/Publications/GDC2009_ValvesApproachToPlaytesting.pdf https://valvearchive.com/archive/Other%20Files/Publications/...