Q13 is a company-sized game covering science fiction warfare aimed primarily at using 6-15mm figures. It uses the same basic mechanics as IABSM and/or CDS, but is as different in flavour from them as they are from each other.
Q13 is not based on any particular science-fiction universe. The rules are generic: providing a framework into which you must fit the armies you want to field. This framework will translate the vast variety of concepts possible in an effectively infinite science fiction universe into a common idiom, allowing the game’s systems to operate.