I Ain't Been Shot Mum! (abbreviated as IABSM) is a World War II tabletop skirmish miniatures wargame produced by . Designers Richard Clarke and Nick Skinner started work on a set of rules for the Vietnam war. Feeling that the existing rulesets allowed too much control over their forces they set out to design a set of rules that would force a player to think as a real-life commander rather than a gamer. As such, IABSM has been heavily influenced by the Kriegsspiel approach, usually (but not always) utilizing an umpire to help decide points of issue that arise during the game such as modifiers for shooting, spotting enemies, etc.