I have never seen Catia in action, but my understanding is that Catia is a software package intended for "cradle-to-grave" manufacturing. Maybe there are different levels. I do not know. The idea of "cradle-to-grave" is the software has capabilities of drawing, design, assemblies, modeling, model testing, bill of materials, work order creation, time study, etc. In other words, you can design an entire aircraft from nose to tail and account for every part, including every screw or rivet, and every part is linked appropriately to every other part.