Abstract: A computer program apparatus for analyzing design tolerances having a computer readable medium and computer program instructions. The computer program instructions are recorded on the computer readable medium and are executable by a processor. The computer program instructions are capable of performing the steps of facilitating the graphical identification by a user of a first and a second entity, identifying any objects related to the first and second entities, storing the identified dimensions and tolerances relating to the identified objects, and, analyzing the stored dimensions, to, in turn, determine the interfacing of the objects relative to each other.