Summary: There is a common expression among computer personnel "Garbage In, Garbage Out" (GIGO) which gives this film its title. It illustrates that there is no magic in a computer. If you give it a stupid instruction you will get a stupid answer. It is only as good as the raw material, which is the programme: the instructions and information fed into it. This film shows how the computer handles the information it gets as long as it is expressed in numbers - and that covers any shape, fact or theory about the material world.