NeoCASS includes two main modules, named GUESS (Generic Unknowns Estimator in tructural Sizing) and SMARTCAD (Simplified Models for Aeroelasticity in Conceptual Aircraft Design), respectively, while is linked to a third module, called W&B (Weight and Balance), used also by other modules of CAESIOM procedure. AcBuilder is a specific CAD module used to generate the aircraft model to be analyzed by NeoCASS.