1. A method of checking consistency between a first computer-represented graphical model and a second computer-represented graphical model, the method comprising: obtaining model correlation information, stored in a memory of an information processing system, that defines at least one relationship type between the first computer-represented graphical model, including a graph-based model, and the second computer-represented graphical model, including a graph-based model, and which comprises a mapping of objects of the first computer-represented graphical model to objects of the second computer-represented graphical model; checking consistency between the first computer-represented graphical model and the second computer-represented graphical model using, at least, the model correlation information stored in the memory of the information processing system; and ascertaining, using at least one processor, an inconsistency between extant versions of the first computer-represented graphical model and the second computer-represented graphical model using the model correlation information including the relationship type.