MECAmaster Assembly for V6, as MECAmaster Assembly for CATIA V5, is a software dedicated to 3D Tolerance Analysis (and 3D Loads Analysis) helping the designers to work on Product and Process optimization from a geometrical point of view from preliminary phases to advanced design phases : Is the assembly concept optimal taking account of defined requirements ? Is the assembly process well adapted ? What is the best specification/tolerance to define on my Part ? What will be the consequence on my assembly of a tolerance modification, or a non-conformity ? etc. With MECAmaster, integrated into CATIA, you will have the possibility to simulate the impact of Product and Process tolerances, and the impact of Assembly Concept / Assembly sequences on the 3D geometrical requirement thanks to a powerful 3D Tolerance Stack-Up Analysis.