FULLY LAZY LINKING

A method, computer program, signal transmission, apparatus and system for fully lazy verification of instructions in a module of a computer program include first determining whether an instruction in a first module which is loaded requires information in a referenced module different than the first module. If such information is required, it is then determined whether the referenced module is already loaded. If the referenced module is not already loaded, a constraint is written for the referenced module without loading the referenced module. The constraint is then checked when the referenced class is loaded, if ever.